:) Would like it to have an altimeter function; possibley heart rate and cadence as well.

I saw a Polar model and Blackburn on-line. Any comments on those?

Any others you'd recommend?

Garmin Edge.

The SIGMA BC2006MHR has altimeter, heart rate, temp, etc, no cadence, for a fraction of the price of the others (I got mine for about $100). Some folk have reported problems w/ connectivity and interference from lights, but I haven't had problems. Also, the manual stinks, but overall I love it.

Had a Polar 100, it sucked and the batteries aren't replaceable in the HR strap or sensor. Sending back for repair could cost as much as a new one. Brother has a Blackburn and is pleased with it. I now have a Edge 305 and it's fabulous.