I've been leasing an IS350 for the past three years and now that the lease is up, I am looking for a 2004 LS430. Because I am on the road a lot for work, I need to have Navi and Bluetooth, and my budget is about $20k - $22k. It seems that I can find quite a few cars with 50,000 to 60,000 miles for that price range, but no Nav. So I wanted to see if you guys have any ideas of where to look (besides ebay, craigslist, cars.com & Autotrader.com) to find a good deal, and to tell me if it is possible to buy an LS430 without Nav and then find a Nav unit on ebay and install it?

Thanks very much.