seen lots of em, go to your local electronics shop they should have a demo.
-what I dont like is it doesnt play mp3/dvd's would be great to have 4.7 gigs of music
-the interface I found was a little laggy compared to their regular head units,
-You should really buy a double din kit and do the flip flop pocket mod otherwise the screen is going to cover your heat vents.
-even if you take your face off the N1 is attractive to theifs, since it has the dvd/player screen in it, a theif may just take your empty deck and get a face online, make sure you have some interal sirens in your car.
I say if you got an extra couple grand to spend its a cool unit but be realistic
do you really need mapping? if so you think its worth $2k?
are you ever going to watch a DVD in the car? When its installed it probably wont play dvd's while moving, (grounding the ebreak will avoid that, if its for your passengers)
its a slick head unit, 2k could buy you a nice set of shoes and socks if catch my drift
...and that's a good call on saving for rims, etc...get the important stuff taken care of first, then blow some $$$...good luck! 
