Heart Rate Monitors

[Suzi-Sue]

Just use a Polar RS200 (think it's great btw )
(waterproof too, although, never tried it in the pool)
Logs a lot of info, cost me £75.

Tells you everything under the sun.
*Max HR - bpm & %
*Avg HR - bpm & %
*How long i was in the HR zones for (you can customize your own zones and have different ones saved depending on what sort of ride you are doing)
*Stopwatch view (also has an easy lap function, so you could hit it when you get out of the pool, and that would be for example, your LAP 1. Bike would then be LAP 2, then hit it before the run, and that's your LAP 3.)
The computer will summarize all this for you, but also give you a total time at the end.
*Calorie view
*Zone view

It stores about 2weeks of info on it. You can also upload to polar's online training coach via PC (haven't tried this yet I use Mac, but looks to be a good feature anyway)

Also has training 'zone locks' - when you reach your target training zone for the ride, just hold a button and it will know how you are training. (an alarm can also be set for when you drop below or go above the zone, such as on those lovely hills )

Oh, and as for wrist size, the RS200 is on the 3rd notch (out of 14), pulled v.tight. I normally wear it on the 4th. And my wrist are tiny, about a 14-15cm circumference.
The body of the watch is quite bulky, but it's needs to be due to all the info you see on the screen at once.

Hope this helps! I remember spending weeks looking for the perfect monitor