Check out the computers from Specialized (www.specialized.com
). I wanted pretty much the same thing you did (all the basic functions plus temp, cadence, %grade, alititude). Specialized has one on their site, the classic pro for $99 that does all that, plus it's wireless... the cadence part is wired. I've had it for about a week now, and I really love it. Plus it has a backlight function for when you are riding in low light. I commute to work and when I first start out in the morning I need lights. My old computers were worthless cus I could never see them. It sucks to find out the compute didn't turn on or something like that after you've been riding for 20 minutes.
Anyway.. I highly recommend you check them out. My previous computer was a Vetta V100 HR Wireless... The HRM function was nice, but not exactly what I expected. I went with a real HRM instead. The wireless was ok, until it started freaking out on me. I kept getting very strange readings..... Max Speed of 80.7 mph... stuff like that. There was no way I went that fast. I checked out everything. Plus the numbers are very small on it... sometimes I had to really look twice to see what it was saying.
Before that I had one of the Trek computers with Temp. I don't think they make them anymore.. but it was a GREAT computer. Anyway... good lluck
Edit: to just add that you can go without the cadence option and have it totally wireless. Then you still have the temperature, altitude, and inclinometer (Very cool in my book).