I went ahead and purchased the Garmin Forerunner 310XT. You can get a bike mount for it, so that part isn't a problem. The ability to wear it on my wrist during other sports for measuring HR is well worth the money. A great review I found while I was in the process of figuring out what I wanted.
http://www.dcrainmaker.com/2009/09/g...th-review.html