I am out shopping to replace my beloved '02 which was totaled. I want to get at least an '04 w/the sharkfin and, from searching the ads, there are a few around with oem nav, but it doesn't like these units also support xm/sirius. Is this correct? I'm not opposed to buying whatever oem I need to make both work, if such an option even exists.

Lots of 2.7's available, and I never had a problem with my '02, but since I'm looking to 'upgrade' the model year, what about the 4.2? Despite the fact they appear few and far between, they are chain, not timing belts, correct?