Looking to purchase a computer for the bike; mostly to track hills. I like to ride dooing multiple climbs. What is the difference between wireless and wired?

Wireless requires two batteries and can be interfered by high output lights or high capacity power transmission lines. And no, can't give you recommendation of a model.

Wired uses wires, wireless doesn't. ;-)

I have a CatEye Adventure, which tracks elevation and slope. I'm generally pretty pleased with it. It uses a digitally encoded signal, so I don't get interference from lights/neon signs/etc, unlike some of the other less expensive wireless bike computers we have in the family.

I have a similar question. Recently getting back into riding after a decade or so off. I had experience with simple bike computers from the mid 90's but I'm totally lost now. What should I be looking for? What should I avoid (brands, features, price ranges, etc)? I guess some computers use GPS technology... are those super expensive? Are they worth it? Any guidance would be appreciated.

GPS technology means you know where you are, and can track (via software on computer) where you've ridden, and view performance on sections of a ride, rather than peaks and averages. In some units, navigation is possible, either via predefined routes or to user-selected points. I love GPS, but I have a decent lifestyle and can afford them. Some may find it excessive, etc.

While mine(Blackburn Delphi 6.0) doesn't have GPS technology, I have avg./max. cadence, avg./max. speed, avg./max. heart rate, altimeter, date, time, ride time, total time. I thought about replacing it with a GPS-enabled bike computer. But since the GPS would probably not be removable, I didn't want it to increase the likelihood of my bike being stolen.