If your DM is allowing a lot of things, ask about the Mystic from the Dragonlance Campaign Setting. Essentially a Cleric with Sorceror spellcasting, which makes for lots of healing spells. You chose one domain (Healing, clearly, or you can pick a Domain that will allow you access to Radiant Servant of Pelor later on), and from there you can move on to Combat Medic.
My suggestion would be to make a 1st level Aasimar Mystic, and be VERY careful for your first few levels. Buy back the level adj ASAP, and then rock and roll. Your starting states could look something like this:
STR: 10
DEX: 12
CON: 16
INT: 14
WIS: 20
CHA: 14
By level 8 you should have base of 22 Wis, plus a +2 Wis item for a total of 24, which will grant you 2 1st, 2nd and 3rd level spells, and 1 4th through 7th spells. DC's on your Hold Persons start to cause serious trouble for fighters, and the DC from the sanctuary spell start to hit mid 20s. This build, after the first initial levels, is REALLY STRONG.
Re-read my post above: At level 8 he was casting Mass Vigor, Lesser, and the ENTIRE party had sanctuary for a round that can only be broken with a will save of 26. 26!
At level 9, with Augment healing and the healing domain, he's healing Cure Critical at 4d8 + 18, and can cast 8 0 level, 8 1st level spells, 8 2nd, 8 third and 5 4th. Next level it becomes 8/8/8/8/6/4