I see a lot of Garmins at DH's mountain bike races. I also see a lot of Garmins pop off handlebars at the races. For a handlebar mount I wouldn't do it because they aren't cheap and I am frugal. But I have heard people carry them in their packs.

DH has a Cateye wireless for his bike, I am still computerless but will probably get one. I like his wireless for simplicity of install and lack of wires to catch on anything. Not sure which one he has but it was about $50.