My performance membership is about to run out and since I still have some money left in points without any intention of renewing, I decided a heart rate monitor would be a nice training tool as I get more involved in racing and training. I'm debating between the Ciclosport HAC4 (any difference between the Blue and the other more expensive one they have listed?) and the Polar S520. The HAC4 appears to have some interesting features I could see myself using (altitude, grade, temperature to name some), however it doesn't have an included connection to the computer as the Polar does. I think having the information on the computer could be beneficial to me, but I'm not sure if the expanded features of the HAC4 outweigh the fact that it's pretty expensive to buy the link cable. Anyone have any opinions on the two specific models, or brands in general (I've heard a lot about polar, but not ciclosport).

Also, will there be any "hidden" fees to these such as the chest sensor or anything else? Thanks.