As one of the only "single stage" advocates left on the planet, I assure you you can polish it, wet sand it, re-paint areas you mess up, and get it as smooth as glass if you like that look (I don't personally).
You can also make the paint as perfect as you want it and then clear coat it (though you then eliminate the ease of maintenance of single stage if you do).
The beauty of single stage is that the more you wash, polish, and wax. The better the paint looks. You can use a power polisher on it aggressively, and If you rub, or sand through to metal, just clean and mask the area and re-spray.
Base/clear gives you about couple 1000th's inch of clear to work with. If you rub through, or get a chip, the whole panel needs to be sanded and re-sprayed, which never matches exactly.
When you are happy with the look of single stage, wax it, and it looks as good or better (no swirls) as base/clear.
My opinion anyway.