Autocom has been my choice. Best cable / adapter / setup selection by far. Dealers everywhere support it, or at least know of it enough to help you when you're on the road.
I have an ancient Pro-7 that I've used in two bikes. The "trick" to them is putting an extension cable between the unit and the helmet tail cord. That's the lenght that takes the most abuse).
J&M is also not bad, but not anywhere near as flexible.
http://www.autocom.co.uk/
http://www.jmcorp.com/
http://www.midlandradio.com/CB-Radio.WYQ/75-822
If you want to try and bluetooth integrate phone and iPod, take a look at:
http://www.parrot.com/usa/products/m...s/parrotsk4000
(I haven't used one, nor have I known anyone to - but it looks interesting)
http://www.parrot.com/usa/products/b...parrot-mki9200
(eventually I'm going to try and integrate one of these onto my bike/intercom setup)
As always, YMMV...