Which womens Garmin hrm?

Hubby being a big cyclist and Garmin user wants to get me a Garmin hrm for my birthday. I would be quite happy with a basic Polar one but he thinks Garmins are the best so I have no say lol. Anyway does anyone know which one would be suitable for me? I want something that will show the amount of calories burned and heartrate training zone. I will be using it mostly in the gym (unless I take up running outside) so GPS is not crucial.
TIA
Bec