Druid Tank Questions - Lordaeron

Since i saw "-Raenel-s-Comprehensive-Feral-Tanking-Guide" i really want to try it, but i have some questions about gearing:

-is Polar set from Leatherworking the BiS item for some pieces? It gives alot of stamina and 1- 3 sockets but no base agility or bonus on equip.

Im using this site "http://wowwiki.wikia.com/wiki/Wrath_tanking_equipment_(druid)" to make a quick search on items, probably some items that are better arent listed.

Is it really worth? Or is better to sacrifice some stamina and use a balanced item?

Bump, can i get some answer?

It really depends on your other stats: it is not really useful if you have a huge health pool but you cannot keep aggro (lack of expertise and hit) or the damage you take is "unBEARable" (lack of mitigation and avoidance).

My personal thoughts without any proper evidence - so let's call it my hunch:
For chest and belts there are easy-to-obtain ilvl200 epic items (T7 and crafted) as feasible options.
At least for the boots I would recommend crafting the Polar thing. Even if you manage to get a lvl213 item, equipping one polar item can be useful in some fights (e.g. Sapphiron).