So the speaking mic on my Ericsson T637 recently konked out...and my phone will only work with a headset now. I have a cheap wired one...but I think it'd be easier in the long run to get a wireless one. The phone has bluetooth so I just assume get that. Are there any good ones that are under $50 that work well? I don't know much about them (battery life, range ect) but I'll need to use it whenever I use my phone. Any suggestions?