I appreciate everyone taking the time to give me input. I am buying the car. I find I am happy enough with the nav on my phone and with OnStar's nav, I think I'll pass. It wasn't a feature I ever wanted, so having to buy it just to get the Bose rubs me the wrong way. I think I'll likely do what a few people suggested and put in something later if needed. Who knows I may not even hear the difference on account of some minor hearing loss suffered at a Slayer concert in the mid 90s. Oh well, it was worth it.