Polar is one of the best, it's one that we use for clients as well as for the athletics. The new F11 is awesome as you can tell it what calories you want to burn this week and it’ll tell you if you met your goals etc. Polar gives you a free account to track your progress etc, and you just upload it directly from you watch.
I bought a F6 a year ago and love everything except for the size, I have a 5 inch wrist and my wrist is only about 2 inches a cross, so the darn watch hangs off both sides of my wrist, but it does have enough holes in the band that I can tighten it down so it doesn’t spin around my arm. The size for most people probably isn’t a concern, but thought I’d mention it just in case you had small wrists and weren’t shocked when you got one.
Kit