There are 3 sorts of priests... I think
1st: Healer you need a fair amount of wise ( 5 wise per lvl ) and link gears with wis6s... But make sure you add REC (2-4 per lvl depending on mode) and if you have spare slots... Put in rec6s
2nd: BP... I suggest same build as a mage... So go INT mainly, but make sure you get some defense by adding rec and ele's and such... INT6s in gear are very good but the ele's do the difference for a DPS-builded toon
3rd: TANK... Just go full rec and use your spare slots to link wise to selfheal once in a while... You won't be that useful to pop, but its a very fun build to make fun of the opposite fractions ubers
for additional (extra) uberness I recommend Remedies and Nostrums

they help a lot, but cost a lot :s
I hope I could help you as much as the previous repliers did
