I think it really comes down to what you're trying to achieve. If it's a solid color I'd definitely consider single stage. Just know that it asks a little more from your spray environment. You really want everything clean before you start because, unlike a basecoat/clearcoat job, you can't stop and nib sand between coats if a piece of dirt lands in the paint. The upside? When everything goes well, it's really rewarding. A good single stage job can come out looking amazing right off the gun. I've had really good luck with Nason Ful-Thane. Here's an FJ40 I sprayed with it a while back. It came out great straight from the gun - no cutting, buffing, or polishing here.