New bike--Trek Madone 4.5 AND bike 'puter ?

[Catrin]

Bike computers are very helpful, but not everyone uses them. Garmins are quite expensive and do have very many features. My Sigma 1609STS is wireless, has everything I need, and cost $90 though I paid $75 on sale

If I were you I would do more research on the internet, and catch a sale on whatever you settle on. I know nothing about Bontrager computers, they may be fantastic, but they do sound overly complicated and expensive if you have to buy extra parts just to get speed

Wireless computers are quite easy to install, and come with a manual to help with setting it up. Are there other bike stores in driving distance that you can visit to see what else might be available locally, or who could help you with installation if you aren't comfortable doing it?