Anything by Carter or Stan is good, I like the Stan Shoot off for the easy of adjustment. To adjust the Carters you have to change a small spring.
Also, if your planning on learning back tension with this release you might want to try a few three finger and a few four finger releases. In my experiance once you get that fourth finger on the release it makes for a harder release when it comes to back tension. But that's just me.
Take a look at the classifieds over on AT, let somebody else take the big hit on a new release and get a used one intil you decide what kind of release you like. It takes most people 4 or 5 different hand held releases intil they find one right for them.
Oh and welcome to 3d shoots!