cock ring recommendation

I've never used a cock ring before, but after a few mild clamping sessions (with a cable clamp) I thought I might want to get a little pumped for sex and see how the wife enjoys it. What kind of CR should I get 1) for a first time user and 2) to get a simliar pumped up appearance as with my clamping session? I've read some old posts, but would like some direct advice.

The rings from http://www.backlashleather.com are nice. You cant beat the prices at $2 each either. You can pick up two or three and see which fits best that way.