I too have the Cateye CD300DW, and am very pleased with the performance. I like having the front end of my bicycle clean (nothing on the fork). I haven't had any issues with poor pick up by the receiver, works very well. I paid $89 plus shipping though E-bay (brand new).
I didn't look real close in a catalog I got recently but I beleive Polar now has a computer with speed, cadence, and heart rate. Like I said, I didn't look closely so I don't know the model number or anything.