I remember that and I would really love to do that again like in the good old days, but I'm not sure they release cata classic.
When these characters would eventually level up they would get ilvl 463 archeological weapons at level 85, was insane.
Most insane though was that dude who got the epic...
Yeah, you might also want Northrend alchemy at level 25 to use endless mana potion and endless healing potion. If you don't use those you can use PvP potions from Warsong Gulch vendors (major healing draught and major mana draught).
I'd take alchemy as a last profession because you don't need enchanting and jewelcrafting to use gems and enchants but you do need alchemy to use the permaflask.