Tanking statsFollow

"2.4.2 What kind of gear does an end-game Tanking paladin look for?
An end game tanking Paladin will of course get all plate gear. The stats you should be looking for are: Defense, Stamina, Avoidance (block rating, dodge, parry), Strength and Block Value."

So not looking for spell power at all? It sounds like you should be looking for the same gear as a warrior tank? Is that correct?

I'm still confused on choosing gear. If I have two pieces of gear. Same stats except one has +25str and the other has +75 spell power. Which is better?

Hmm, that looks fairly close to breakeven (chart taken from a beta thread, so coefficients might not be up-to-date):
[1 Strength = 2.3 AP]
SoVengeance (5-stack) = 19.5% AP + 9% SP (+1.2% SP / hit)
Judgements (base)= 32% SP + 20% AP
Consecration (per tick) = 4% SP + 4% AP
Hammer of Wrath = 7% SP + 7% AP
Holy Shield = 10 SP + 8.6% AP
Avenger's Shield = 7% SP + 7% AP
Shield of Righteousness = pure Block Value (Strength in part)
Hammer of the Righteous = 4xDPS (Strength in part)
Exorcism = 15% SP + 15% AP
Holy Wrath = 7% SP + 7% AP

That said, it's unlikely to be an issue past level 70 gear. The reitemization should make it so that anything with defense and/or avoidance will have strength and no spellpower. For jewelry and trinkets, 3 SP looks pretty similar to 1 STR.