You should raise your strenght and dexterity to the point where you can wear an ancient sword, then go massive vitality since hitpoints can be a problem for paladins, energy isn't needed because you should have sufficient mana leech.
Same but you might want to have higher strength and dexterity due to blocking and higher requirements, also leech in nightmare will be halve and in hell it will be 25% but if you have about 5% leech in hell it should be fine.