I have to disagree... I have the 7290 and have tried the BT250, HS810, HS820 and HS850. I rate the HS850 FAR AND ABOVE all the others. The sound quality is exceptional (albit, it was even better in 3.8!!!) and the unit is so light, you forget you have it on.
I would have to recommend the HS850
Crackberry User and Addict.
7250 on Verizon w/EVDO and 4.0.2 Update (Active)
7290 on T-Mobile (Retired)
T-Mobile 7230 (Retired)