Maaco, as grouch stated "can" do good work as long as you do the prep work and take it to them fully prepped and ready to paint. Ive seen a couple of cars a few friends had done in a similar process that seemed to be above their average quality curve too..
As far as a choice of paint is concerned, I prefer a urethane based base/clear compared to any single stage topcoat. Urethane or not, a urethane base/clear paint job is simply tougher, they get a lot harder. A single stage paint coat never really dries, technically its always soft, therefore not as tough.
As far as how many quarts it takes to paint a CRX, well that depends on the kind of paint you use... With a standard ppg or dupont basecoat, Ive heard of people getting the job done with a quart of color. Dupont chromabase has a 1:1 mix ratio so youd be getting 2 quarts(1/2 gallon) when you add your reducer, so paul was pretty close there. And usually a basecoat is the most expensive part, dupont has a value line of clearcoat under their nason brand that is really good, and runs around 100 dollars for the clear and activator.