I personally use a Pioneer AVIC-N1. Now this is the early model, and I believe they are an N3 now. I paid $1500 for it. OK I know that is alot over the top, but I have had it for 2 1/2 years and I have never felt ripped of. It is an in dash stereo w/flip out 9" screen. It has Gps with only 2 disks (East US canada and mexico and then West US, Canada and Mexico.) The disks don't have to be inserted after initial address input. It has a small backup camera that I purchased on EBay for $60, I can watch DVD's when layed over. It has a vehicle dynamics screen which reads accurately your voltage, mph, g's around corners, % of grade of hills, compass and a few others. More importantly you can request the trucker version of the software so you don't have to worry about bridges and non-commercial roads. Another attachement that you can purchase is the TV tuner so that you can hook up your satellite TV, which I didn't purchase cuz I don't have satellite TV. Also, you can DL pics from your pc on to a CD and have pics of your kids or whatever on the screen while driving down the road. Plus you don't need to have your bulky laptop out, everything is tucked nicely into the dash. For me this is a necessity since my dog would be very POed if she couldn't sit in the front seat. It's been a very valuable purchase in my eyes, and I have never regretted it.
Whether you purchase the pioneer or any other GPS, I've found it very satisfying to have. Being lost really stinks. ANd if the technology is there why fight it?