Just my thoughts:
Went to my local car audio shop, asked about work on my Zed and if I would retain any steering wheel control with my Bose system.
They said I would almost certainly loose them.
Then I see srobiens thread about the install of a Pioneer AVIC-F900BT, which is very detailed and very useful (and retains the steering whell controls and works with the Bose system) http://www.350z-uk.com/forum/viewtopic ... highlight=
So basically I'd say, if you got a Bose system in your car, you can't go wrong with that guide, just get the appropriate steering wheel control cable for the brand HU you intend to buy.