Touch Screen Options for '07 H2

[ATBH2]

Newbie to the site and recently bought my first H2 and love it! But...it has the factory AM/FM/XM/CD radio. Nice sound, but looking for NAV / DVD and ability to install backup cam.

Can anyone tell me what factory options are available to achieve this? Do any of the earlier factory NAV models work in the 2007, use the same wiring harness and activate the steering wheel controls?

Thanks for your help!

Newb