offtank has the advantage that you can use a 2h weapon, your flames of devotion making some damage and therefore being usefull besides the protection spell - then you can also use the triumph skill...this way with lay on hands and the zealous endurance you would have 4 defense enhancing skills...sure your loosing out on the oathsworn buckler...but i kinda like paladin builds with greatswords better than with s&s
right now im playing a kind wayfarer with a 2h who heals so much through his special skills that i never need lay on hands nor has my priest anything to do....
something like this to keep the overall "defense theme" maybe
flames of devotion, shielding flames, zealous endurance, deep flames, lay on hands, shielding touch, inspiring triump, weapon focus, reinforcing exhortion, 2 handed fighting, healing chain, scion of falmes, sacred immolation
statwise i probably just pump everything into might, intelligence and resolve...either 16/16/16 and the rest at 10 or pumping perception a bit up like 15/15/15/13