how much you willing to spend......just over a year ago i had the sony HCB-700 model installed (was the dogs nuts then with the LCD and seperate control unit, voice recognition blah blah)...... cost me £100 from carphone warehouse (they were doing a deal ta the time) and had £20 voucher for my phone trade in....so cost me £80. However it cost me another £100 to get it installed into the car with the sound transfered to the car speakers when someone called.
TBH you will be looking for around the 100 mark for a fairly good one. The parrot makes are fairly good and not too expensive on the net. Let me know how much you want to spend and i'll see what i can find
Have been looking myself at a car hands free kit and didn't want to go down the headset route.
Found this at the link.com Kondor BTVISORL Visor Mount Hands Free for £45.
And you might be able to get 5% as theres a code been posted in vouchers and codes for the Link(not alot but it all helps)
Halfords also do a Bluetooth one that plugs into your Cigarrette lighter. Looks a bit like a gear stick but includes a built in speaker/mic etc. Pretty neat and you can easily move it from car to car. Cost about £30.
be warned tho when you have an all in one mic and speeaker system the quality wont be that good also you can get a lot of feedback/noise. generally speaking carkits with seperate microphones are a lot better. not to mention the charging of portable devices
you would be better of getting a carkit bluetooth system with seperate microphone etc and a basic one will set you back about £60-£80