Stick with the 2001 Camry

I have a 2001 camry with 118,000 miles and it runs well. I have had it since 2004 and have done a good job with maintenance. I don’t want to spend the money on a new car, but I would like my car to be a little nicer looking (new paint job and maybe alloy wheels) but I am concerned about making the investment if a major service problem exists under my hood. What system or parts do I need to check before I make the investment in the cosmetics of the car? Since I drive about 8,000 miles per year, the money saved by not buying a new car makes sense–again, as long is there is no large expense which I did not consider before making the cosmetic investment.

Thanks in advance for your thoughts.