I have a 2004 Acura Tsx..finance options? can i sell it back?

I have like 17k left to pay off. Im payin 450 a month and I want to sell it back i think to get a nice but no more then 5k car so that I dont have payments anymore. I i can keep that 450 extra a month in my pocket. What should I do? Does anyone know if when you finance they buy back or will i totally lose out. I bought it with 40k miles its on 50k now. It has been 1 year since I financed.