If you aim to be a Defender/Healer hybrid, CHA/WIS is the way to go. Unfortunately it implies lowering quite a bit your defenses (CHA and WIS being keyed to Will). I'd suggest looking at the Hospitalier Paragon Path and build yourself toward it. If you want to be a healer, no paragon path will come close to this one.
Stats wise, I second (third?) choosing either STR or CHA as your primary attack stat. Chances are that you will want to go with CHA for more Leader-ish powers. Anyway, Bolstering Strike and Enfeebling Strike are probably the best At-wills you can get for a Paladin
For Feats, right now there is not a lot to get. Best choices are probably Healing Hands, Channel Divnity (don't know your god, seem Home made, ask your DM what his Channel divinity is) and probably Toughness. As soon as PH2 is released, make sure you get Melee Training (CHA to Basic Attacks), it will greatly improve your "stickiness".