How much to replace rotors, calipers, and pads on altima?

I have a 98 nissan altima, and I've let my brakes go pretty long without changing them. They have gone past squeaking and are now grinding. I know I'll have to get pads and probably rotors for my front two wheels, but I'm not sure if its gotten to the point to where my entire brake system needs to be replaced. Lets say it does. My car was apprasised at $1900 w/ my bad brakes, $2350 with new brakes. I'm thinking that if the repair approaches the value of my car, I might as well wait a few more days and get a new car, since I have the money to do so, but don't really want payments. Any ideas?