Autocom do pocket unit, this is a suitable option and generally last longer than the fitted ones.
I had a great set up with my XDAii running Tomtom (voice comms) as well as music library and obviously cellphone, unfortunately the compatibility was a pain, and I havent found another cell phone with the 4 core mini jack connector that disables the Microphone on the cellphone since I upgraded and finally broke my XDAii

Then the whole thing started to go tits up electrically, something to do with rattling itself to death... I was running for a 150 mile round commute for 2 years, however a pocket mounted one would have lasted longer.
Also dont mount it onto the frame.
I am now exploring Bluetooth options.

For a touring bike I am depressed it doesnt have a cubby hole or suitable secret space under the seat... darn cat boxes.