Single-stage recommendations

I wanted to freshen the paint on the 73, so I did the body prep and took it over to MAACO who sprayed it with single stage poly for $500. I went by several shops and looked at the works in progress before settling on the shop I used. I found a bad run later at the B-pilar on the driver's side. Took it back to the shop. They fixed without problems. That was two years ago. The photo taken two months ago.