It really depends on how much you have to spend. The cheapest solution is from Heil with their Traveler series. You buy the headset plus HT adapter cable and you're good to go.
http://universal-radio.com/catalog/mics.htmlThis is probably your cheapest solution -- at about $95. Heil products are usually very good -- so it's not a terrible investment.
http://universal-radio.com/catalog/mics/3082.htmlOf course you can always buy a Yaesu VX-8DR and buy the BT option module and their matching BT headset. Then you're wireless! :P
http://www.hamradio.com/detail.cfm?pid=H0-010366