My vote is for Lathander, with the Renewal and Sun domains. Blasting undead to powder is just too useful, and the ability to return from negative hit points is a perfect safety net.
Doctrinally, he is fairly broad in outlook and not particularly constraining and thus it's easy to find an angle that you can roleplay. I don't agree with the previous comment that his clerics are "perfectionists and pacifists" (that's purely IMO and no offence intended). While perfectionism is something they would strive for, not being a Lawful deity means that the mean streak that makes "perfectionism/t" such a perjorative term is not an issue (again, IMO).
Also, if you're playing in the Silver Marches, there are some nice longer term quest ideas in the SM Web Enhancement. Basically, the head of the church in Lathander is the one who successfully recovers a certain item of which there are at least four. If your goal is to settle into a leadership role at a higher level, there's a perfect hook.
Cheers
D