Uncle Stinky, the GPS/HRM I have is Garmin Edge 305. It is for bicyclists. So, it is normally bundled with cadence and speed sensor. I bought it at a good price. It seems like the sale ($276) is still going on at
Amazon.
When I used it, I liked it. I'm an engineer, so it excites me to look at all the data after a ride. And it is even more exciting to look at the route in Google Earth (with satellite images). If you get a Garmin, it is almost certain that you will become a
MotionBased user. That's where you get a file that can be opened by Google Earth.
However, I found myself use it less and less. Especially if I am repeating a route. Also, the little plastic bike mount where you snap the GPS broke on my mountain bike. My device fell on the ground. Now one button stopped working. Having had this experience, I wish I had bought a Forerunner 305 (also
on sale right now). It comes with a wrist band, which I think will last longer than the bike mount that comes with Edge. However, you do have to purchase cadence and speed sensor extra.
If just a HRM, Mr Mud's hardcore cyclist friend Tom really likes his Polar 625X, which is a bit more expensive.
Happy shopping!