Mike,
I usually do a satin finish. I use the Polyurethane spray cans you find at wallyworld. It has the spray nozzle that fans out, just like a real spray gun, and it mists real nice, so you get a real smooth finish. Just make sure you don't get the waterbased stuff. It's basically crap IMO.
You can also just use any finish, gloss or otherwise, and use a #0000 or #000 steel wool to buff it down to a satin finish.
Joe