Garmin's are great since you get to record your rides, and if you opt for using the heart rate monitor - you can use the data to train.

I have the non-bike specific Forerunner 305, since I'm using the HRM for indoor activities. I want to get an 800 though, so I can get lost at will on long rides.

For non-gps / hrm computers, I use a Cateye Strada wired & a Sigma BC1606L wired. I prefer the bike mount on the Cateye Strada much more, and have had no problems of it falling out of the mount. I've had the Sigma fall out of the mount a couple of times and now it has wacky issues. The Sigma has slightly nicer features, but the Cateye would be my recommendation.