You probably wont find a GSR for 5k unless its an insurance write off or something. They just arn't that cheap yet.
Otherwise, the only time I dont like the GSR is when I have a girl in the car. Its kinda noisy when I'm driving with her, and the AC is broken too so teh girls really dont like it. I get all sweaty...blah thats about it.
The maxima would be a better car if your concerned about road noise and comfort (for 4 people). Since I don't care that much about those things, I got a GSR.