I tried a couple of SE and Motorola's as well as a few off brands. I would suggests you actually go out and try them on YOUR ear. As they do fit differently for different people.

Pair your phone to them and make a few calls; some are actually louder then others.

I have a SE HBH 660 which is their top of the line bluetooth headset and it works great for me. I volume is excellent; I tried others and people say I'm not that loud and I honesty have trouble hearing them. But with this; no problems. It's lightweight and has a caller id display. The nosie cancellation works like a charm and it doesn't pick up any unnecessary noises.