Point store - what first?

Hello. I am starting to gear rogue soon. I want to buy first item for 80 lvl.
I am focused on pvp but i wonder which item will be hardest to get on this lvl.
Like u can drop something fast from dungeon, but have to farm a lot for back, trinket, neck idk?

I would like to get some 239 ilvl item from store for points, but i am afraid that i will get fast item 227/232 and this points will be wasted.
If u could pick any item from store, what would be good options?

https://i.imgur.com/JFMWHAk.png