Well, if I read between the lines it sounds like you're asking for a little babble.  You're probably well aware that, when the mood strikes, I can certainly provide some babble.  I happen to have a second of downtime here at work so here goes...  ;)

From memory my priest, specc'd to be a healer, uses a very similar [url=http://www.worldofwarcraft.com/info/classes/priest/talents.html?055230003000000000000235051032302150500051000000000000000000000]build[/url], with some key differences.  He's only 40 atm though, but these are my plans for him.  Some of the things I have since questioned with my build design...  First is putting 5 points into wands instead of unbreakable will.  My reasoning was that I wanted, for funsies, to actually LEVEL my priest as holy, but doing so leaves me very little room for offensive spell improvements.  And because of this, my offensive spells are expensive mana wise!  Improved wands gives me a way to apply some extra damage without spending mana.  Since then though, I've found that silence is DEADLY to a priest and have wondered if my initial reasoning may have been flawed.  I can say, though, that if I'm one on one with a mob close to my level but out of mana after a fight involving several mobs I can wand the mob to death.  With my spirit as high as it is I can heal, wand 'til I'm nearly dead, heal again, rinse and repeat until the mob is dead.  It may be slow, but at least I can come out of it alive! hehe

The choice to NOT have divine spirit was a difficult one for me.  I thought about taking points out of holy specialization and/or even doing without spirit of redemption.  When push came to shove I just didn't want to take three talent points from the holy tree in order to be able to utilize spirit of redemption.  Plus I was interested in circle of healing and couldn't see a way to have both divine spirit and circle of healing.

The lightwell ability looked fun - I mean, how cool would it be to have a healing well for anyone without aggro to rejuv during a long fight?!  I finally decided the point would be better spent elsewhere though.  I don't know how much the well would be utilized and only casters would really have a chance to use it anyway.  Since normally the only caster which might get regular use from the well would be a lock I decided not to use this talent.  It'd probably be easier and more efficient to help a locks DPS with heals when possible anyway.

Holy reach, at least so far, seems to be lots less effective than I thought it would be.  I haven't had the chance to heal for a group since I added these talent points, but I did think it would be more helpful to my offense while levelling than it is.  But without being able to talent into shadow reach as well, it just hasn't been all that great for me.  I wish I could pull those talents out and place them into divine spirit, but doing so would force me out of circle of healing.  My current thought is that those two points may be better spent elsewhere, but for now I'll reserve judgment and see how it goes.

And btw, no, circle of healing really doesn't sound all that great for a 41 point talent.  475-525 healing in a 15 yard radius?  Yeah, somewhat situational.  But sometimes you just gotta' go for something and stick to your guns for the simple fact it sounds like fun!