If you already have a few computers in mind, choose whichever one you feel has more bang for the bucks. I've owned both Cateye and Sigma wired computers and had no problems with either one. I still have the Sigma mounted on my hybrid and it's close to 6 years old. If you go with a computer that has an altimeter and heart rate displayed on the computer, you're probably looking at a wireless model which gives you more models to choose from and more money out of your pocket. If you really don't need, or want, a GPS enabled computer, don't get sucked into buying one. I used a Sigma wrist based HRM for years before going with a Bluetooth HRM unit connected to my phone. It doesn't take any more of an effort to twist your wrist and look down at your wrist than it does to look down on your computer. And, if your heart rate isn't displayed on your main screen of the computer, you'll have to remove one hand from your handlebars to be able to move to the screen that displays your heart rate; so there's really no advantage big to having your heart rate on the computer.