I have a Starcom1 Advance setup, with bluetooth module, and use it to hook up to my HTC Desire to play music, handle phone calls and as Sat Nav thanks to Google Navigation!
So far it has been brilliant, and my understanding is that Autocom and Starcom are now owned by the same company and therefore there probably won't be much to choose from between them. I got the Starcom direct from them using the details in the club discounts section, along with bulkhead fitting kits and a pair of headsets (only Optime I, but the gubbins can be transferred if you need more hearing protection, lots of posts on here showing how).
The bulkhead fitting is great, the unit is stuck to the back of the rear bulkhead (inside the boot) and then the sockets for the headsets are mounted in the bulkhead between the seats. They are weatherproof and the only thing on display (although the unit itself is removable if theft is a concern).
Would definitely recommend.