EVERYONE needs a buff. Pots can replace heals =)

3) Rezz/Heal - Although this is definately my favorite skill selection for PK, it really isn't used much, it's sooo hard to exp...
most people who do use it, it's their secondary char, so they just have it there
to rezz them when they need it.

Now, you may wonder, why no Duff/Buff, or Buff/Duff, well, to be straight up honest, it's usless.
I don't know why people would put buff as a secondary, I would rather spend a few minutes finding a buffer,
then having 360 or 720 buffs. The only time I run into this, is for people like my clan leader, who's rezzer is Rezz/Buff,
so he can get the 720 or 960 buff when he's solo'ing, along side the Rezz's.

4. Equipment

Now, this is where the Battle Priest is put to the test. With average equipment, you will fail. A Battle Priest is a damn expensive character, if you want to do good.
Level 1-30 - Use anything you can get knight noah  your hands on really...having some +7/12 or even +8/15 premade armors waiting for you would be nice, and as for a weapon, use anything that you have enough strength for.
Level 30-40 - Pretty much the same as Level 1 - 30, try and upgrade some armors, and maybe even some weapons...a weapon with greater than 100 AP is great at this point (Weight Hammer...Large Breaker...)
Level 40-50 - By this point...to do the best...you would want +7/12 or +8/15 armors (Strength bonus, for now) and a Large Breaker +6 with MP absorb (to save you from wasting all those damned expensive pots)
Level 50-55 Ok, this is when stuff starts to pull together. The ideal equipment would be +8/15 armors, Uniques if you can get your hands on them (Lupus...Iron Belt/Necklace...anything really) and if you can't afford those damn expensive uniques, go for Quest Accessories, they really are good.
Level 55-59 Now, you should start PK'ing, and you're going to want +8/15 armors, Iron Impact, Hell Breaker, or Totamic Club +6/7/8 to do the best. At this point, I would also suggest going Rezz/Heal, you may call me crazy, but once you Parasite a Raptor weilding Warrior who's running at you, then smack him down in a few hits, it all pays off. And ofc, any uniques you can get  knight noah your hands on are good, Lupus, Iron Necklace, Iron Belt, Glass Belt, Skeleton Belt, anything of the sort. To be above average, a Battle Priest really does need Uniques. Also, the thing that holds the BP together, Dagger Defense , a 10 DD cap will do you OK if that's all you can get your hands on...but really a 25 DD cap will have you smacking down sins in no time.