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one of the main problems with indash navis are that they often have out of date maps, have you looked at like a tomtom940 or 930, or the Garmin Nuvi's work great.
Well if you are going for name brand, then $450 is probably as good as it gets. Even knock off or lesser known brands will run you over $400. Sites like www.mp3playerstore.com can get you a 7 inch indash unit for $200-250 and you can buy the GPS add on later, I have used a monitor from them before, it worked pretty well and at a good price, so it might be worth looking into.
I found my Pioneer Avic-F700BT a while back for like $350. I've seen them lately for $339 shipped. It's a great HU and the GPS works well, with built in bluetooth and iPod controls (with iPod cable).
when buying somethng so complex and with soo many options, I would really really recomend steering you towards your local retailer. Yes, you are going to pay more but the service that a good shop can offer on a high-tech piece of equipment like this would more then make up for it.