Should I get put more money

I have a 2000 nissan maxima with 289,000 clicks, rusted, fully loaded 25th special addition I paid 3000$ for it like 3 years ago and must have put in over 3000$ in repairs over the years, right now it needs summer tires, brakes, every time I turn left the steering wheel or left driver tires makes loud grinding noise. And now I have a friend at work selling her 2002 nissan sentra ex with 129,000 clicks runs well has a cracked bumper and the a/c just went but other than that runs excellent, with summer and winter tires for 1000$ ! Should I buy the sentra? And how much would someone give me for the maxima? Thanks for your opinion!