We all know rogues only are as good as their current gear and in particular their weapons. Though I'd argue weapons are the most important.
Though there are many powerful BoE weapons, but with very low droprate (however that is not the case right now, but we should expect a hotfix very soon). Therefore, all BoE's will be excluded. But if you were to manage to get your hands on one, of course use it. But as mention this list will only contain items with a 100% drop rate (I will however include a limited uncommon vendor item, these will put into parenthesis as they can technically not always be aquired).
Disclaimer: I'm in no way, shape, or form, a seasoned leveler. I will be presuopposing level 10-20 through Ghostlands (you may find similar rewards in your own respective zones). I may have missed several items and I encourage you to comment down below if you think a weapon should be added. I also hope I don't trigger the staff by using a foreign database as they do not host their own at this time.
Level 10: Blade of Cunning - http://db.hellfire-tbc.com/?item=7298
Level 11: Stung - http://db.hellfire-tbc.com/?item=24339
(Level 15: Sinister Scimitar - http://db.hellfire-tbc.com/?item=29583)
Level: 17: Sunwell Blade - http://db.hellfire-tbc.com/?item=22783
Orc/Troll equivalent:
Level 15: Talonstrike - http://db.hellfire-tbc.com/?item=3462 (This comes from a chain quest that you can do if you
are leveling in the undead zones. This is the best off hand until you get http://db.hellfire-tbc.com/?
item=33271. Dawn Blade has slightly better DPS but it catches up once you spend
points into sword specialization, which happens prior to level 37 thus it surpasses Dawnblade passt
level 30.
Level 21: Claystone Shortsword - http://db.hellfire-tbc.com/?item=16891
Level 24: Slatemetal Cutlass - http://db.hellfire-tbc.com/?item=16890
Level 21: Dawnblade - http://db.hellfire-tbc.com/?item=22984
Level 23: Outlaw Sabre - http://db.hellfire-tbc.com/?item=16886 (or level 21 if someone has Amongst the Ruins
already).
A special mention is due to be given to this sword as it is absolutely RIDICULOUS for it's level. It will last way into your fourties (a whopping 32 levels!). Get this at all cost!
You will notice that I haven't specificly mention any off hands, which I haven't done on prupose as you will just use your fastest weapon at your disposal in your OH. Also, because Dawnblade will last you (presupposingthat you didn't stick to the undead zones for Talon Strike) to 37. At level 37 you will be able to do: Catch a Dragon by the Tail. It awards http://db.hellfire-tbc.com/?item=33271 and this sword will be in your OH until mid Outland (assuming no BoE drops). Very overlooked and it stands along side Outlaw Sabre in terms of uniqueness.
Level 37: Vanquisher's Sword - http://db.hellfire-tbc.com/?item=10823 (I personally would skip this. It's just slightly
better than Outlaw Sabre).
Level: 44 Belogrom's Hammer - http://db.hellfire-tbc.com/?item=11120
Level 45: Thrash Blade - http://db.hellfire-tbc.com/?item=17705
The choice is yours between the hammer and the blade here. The hammer is from a simple quest chain in Azhara and blade is from Maraudon. I would personally go for the blade as the proc suits a combat rogue very well and I won't have to skill maces all over again (but then again, you'll have to do that anyway at some point).
Level 49: Tidecrest Blade - http://db.hellfire-tbc.com/?item=15705 (if you don't want to go out of your way to get
either of these weapons above, as they do require a fair bit traveling, this one is a fair contender.)
Level 58: Foe Reaver http://db.hellfire-tbc.com/?item=29913
Level 60: Warden's Hammer - http://db.hellfire-tbc.com/?item=25519
Level 62: Extra Sharp Blade - http://db.hellfire-tbc.com/?item=25933 OH
I'm a bit torn wheather this is an upgrade or not for your off hand. If you invoke the "law" that are in the TBC Combat Rogue Compendium you learn that for each 0.1 speed you add 10 DPS to your weapon. Now if we apply that, http://db.hellfire-tbc.com/?item=33271 comes out on top, which you might find strange, in fact disurbing. It is possible that I missunderstood that section and if I did, please do correct me.
Level 65: Mag'Hari Fury Band - http://db.hellfire-tbc.com/?item=25764 (pre-dungeon bis) MH
Level 65: Whistling Sword - http://db.hellfire-tbc.com/?item=31541 (pre-dungeon bis) OH
Level 67: Master Smith's Hammer - http://db.hellfire-tbc.com/?item=29787 (listed for whichever reason you
could not get Ring of Blood done.)
Level 67: Ripefang Paw - http://db.hellfire-tbc.com/?item=30277 (I advise you to not choose this reward as the
gun is 2nd pre-raid bis)
Level 70: Illidari-Bane Broadsword - http://db.hellfire-tbc.com/?item=30788
Quest: http://db.hellfire-tbc.com/?quest=10621 (very lengthty and you will
most likely obtain a better weapon prior to completion).
As you probably have noticed, weapon upgrades in Outland are very scarce. However you will find very powerful rewards in dungeons. During leveling you will be sent to do dungeons which not only will award you with pre-bis raiding armor, but you will also yield a chance on those weapons. Consult Atlasloot to which these weapons are prior to entering the dungeon.
I might include pre-raid bis weapons in the future.
Disclaimer: This is, in my opinion, not a guide but merely a display of my own weapon preferences while leveling.
I've done zero EP calculations nor run anything through any Spreadsheets. The weapons listed are however the ones with the highest damage output.