I would not go back to that guy.
One economical option would be to keep the harness and container, but replace the canopy and lines. Most manufacturers sell those for about $1,000. As long as the harness was protected from UV in storage, it's service life should be unlimited.
I've done a lot of military parachuting, and seen plenty of blown panels. While not a life threatening event, it can certainly lead to plenty of orthopedic bills. A round parachute landing is like jumping off the roof of your car while rolling forward at 5-10 mph. If you are young and fit, and know how to slip or steer, you probably won't get hurt. However, if you run with the wind or hit an obstacle, you can get banged up pretty good. I have personally seen people land in ponds and drown, go thru windshields of vehicles, get hung in high voltage power lines and have to be rescued by special teams, and get suspended from a 100' tree at night. Swapping out the canopy every 20 years or so is not an unwise rule of thumb.
I agree, for light gentlemen's acro by yourself, no need for a chute. I plan to get back into IAC Sportsman and will be pulling 4G on a regular basis, so I need one. Have to have it for contests anyways. I'll probably buy new, mainly because I don't have time to search around for a used "bargain". I also don't want to get said "bargain" and then discover from my rigger that it was not such a great deal.