Steelseries 5hv2 or a Steelseries Siberia Neckband (Only because I have one. =D). I hear the Sennheiser series is good as well, but the thing is I don't own one so I can't say. You can try asking nightmarej4ck here on LYN cause he just bought one. As for the whole soundcard issue, I bought my neckband with the 3.5mm jacks and got myself a RM30 '3D' soundcard and tbh, the 30 dollar soundcard, for me, works as well as the actual Siberia soundcard most of the time. I'm sure there will be people arguing with me about that, but that's just my opinion.

EDIT: If you have friends overseas like I do, I suggest you get your SS equipment from them. I bought my Neckband sans USB soundcard for slightly over RM250 and my friend shipped it back for me for free. That's better than forking out RM366 for a unit.