I bought a Cateye Velo 5 because all I wanted was a basic computer. It hasTime, Total Distance, Trip Distance, Current Speed and Maximum Speed. Now, two weeks later, I'm begining to think more features like average speed would have been worthwhile.

Buying a mid priced computer could save you the cost of upgrading later. The wireless models are also nice, especially if you're riding off-road and help cut down on cable clutter.