Hi Ballymary.
I have an autocom system with a kenwood radio. Its one of the best systems out there but it's by no means cheap. Maplins also do an £80 system which inludes the radio. The one problem a lot of peeps had with autocom was the PTT switch. They aren't very well made and after a while they go oper circuite. I've fixed it by taking off the switch and wireing it into my passing light switch. there is also Starcom but not used that.