I keep throwing this idea out there every time the Favored Soul class gets mentioned and people keep liking it. So, here goes again:
Favored Soul 15/ Thaumaturgist 5.
You can take all the healing spells (1/level), most of the restore ____ spells (at most 2/level but many levels don't have any), the whole list of Summon Monster I-IX (1/level), and the appropriate Planar Ally spells. You will want Augment Healing as a feat. You will get Augment Summoning as a bonus to the Thaumaturgist class, so I recommending taking it at level 9 since the earliest you can get accessto Lesser Planar Ally is level 8.
But think about it. You have virtually an unlimited use of summoning or healing spells. No need to even get yourself dirty! Even if you do melee, your summonings should give you great flanking opportunities!
OR - Grab yourself a bow, because once you start summoning a few critters that have a spell duration of more than a round or two you'll just need to help them out by firing into the melee with your bow. [Precise Shot might be in order.] If you go this route, you would be wise to pick a deity that has the longbow as a favored weapon.
This build allows WIS to be a dump stat, because with the spells you are casting the spell DCs are essentially irrelevant. If you go the bow route, your STR can become a dump stat too - although if you dump it too much you'll go crossbow instead of bow and that'll really make your deity choices rather limited.

But if you do it right ... by the end you'll be a summoning machine, a healing machine, a non-fighter with weapon focus and weapon specialization, and three types of energy resistance! [Not to mention that your summonings will be augmented and extended, you'll be eligible for a planar cohort, and your improved ally class ability can come in rather handy with those "impossible tasks" that DMs like to throw at parties.
I hope you like it.
Oh yeah ... your saves will pretty much rock. By the end you'll be at FORT +10, REF +10, and WILL +13 ... and that's just the bonuses not taking into account ability scores, cloak of resistance, etc. [Your CHA should be high, so Force of Personality from Complete Adventurer could be a boon - and it gives you more reason to make WIS a dump stat.