Another vote for the Zenith.

I have 2 of the 4 finger Comfort Excel+ releases.
Since going to a Zenith, I have gotten rid of all of my other pure BT releases.

That being said, a hand held release is a very personal thing. If you can, shoot a bunch of them and buy the one that feels best in your hand.
Some of the ones you should be looking at:
Zenith
Scott Longhorn
Carter Atension
TruBall BT Gold

I am not a big fan of the BT releases with a saftey on them. I had a TruBall Sweet Spot Ultra 3 for awhile. Every once and awhile I would either not get the saftey set all of the way or it would slip off, resulting in me with a mouth full of fist and release. I prefer a pure BT release. Since making the switch I have yet to have a misfire when drawing or letting down. If you learn do to it right, you will never end up with a fat lip.