Define "nice coil-over setup". I've driven everything on a Honda from stock with springs to $1,500 setups to over $1,400 PER CORNER...on a Civic/Integra! I won't even get into the BMW setups. Anyone that doesn't think quality & well maintained suspension doesn't matter 100% of the time the car is moving then they haven't been in a car that is properly setup.
Doesn't mean he has to go out and buy Moton or Ohlin but with a no-name coil-over dampener you most likely won't get customer service or a suitable warranty with it. I've seen so many coil-overs straight out of the box break dampener/rebound adjustment knobs as soon as they are installed. It's highly unlikely they will replace it.
I always push Tein full coil-over setups but personally I'd get koni yellows & ground control (or eibach springs with no name sleeve). I know you can find used sets from people that have upgraded to high quality coil-over dampers. Hell, for $700 I'm sure you can find used high quality coil-overs from the race/spec miata forums. They may be used but they are probably better than the new no-names plus many of the higher end dampeners are rebuildable so they'll virtually last forever.