Wired headset option
 

I found a wired headset that works with call control for the Evo shift (probably the Evo too, though I don't own one so I can't vouch for it).

It's made by Cellet, the wired 3.5mm boom mic hands-free headset. I got it from amazon for just a few dollars shipped. Shift recognizes it as a headset and the boom mic works (all the others from my random tech drawer didn't have the right mic connection except an old Samsung headset that didn't have a boom).

You press the button on the headset once to answer/end a call when ringing/connected, respectively. Otherwise a single press plays music in the earpiece and stops it. A double press redials the last number, and a long press launches the voice dialer. Can't seem to get that long press to launch Cyberon Voice Command, but I can live without that.

I use this for business calls at home when I need higher outbound quality than my bluetooth headsets can provide.