as i like the 39 bracket -> lock(tabdot a whole team to death) or druid(huge burst with SF and incredible dps with wrath) or mage(decent surviveability + very good burst)
imo casters are the better glass cannons. profs would be JC(for the SP trinket or engi if you can get the BoA trinket) and skinning. a lock does not need skinning -> herb/engi.
lol, i modified a glass cannon template i made for my rog...
1750HP / 542AP / 17%crit
taking talents into account and no buffs (not even the panther trinket) it is possible to get a 680+ noncrit oO
with zerker we are at 1775 crit and potential for more (panther trinket, battle shout...). as you run around with 100%+ critchance every now and then...BÄM!
I would recomend a 39 fire mage twink. If you stack SP you can pull off about 1.4k fireball crits which with ignite can bring in about 1.8k in all! Plus there really fun lol.