Using a high quality latexpaint, a good brush, and a little bit of Flood's "flow-trol" (or is it Floe-trol) you can make a finish that rivals a spray job. The paintwork on our bathroom vanity and bedroom doors is almost as good as an automotive paint spray-job.
That was Sherwin Williams. I've used their Emerald, Duration, and SuperPaint products with good results - cannot remember which was the trim paint -Either the super-paint or Duration Semi-Gloss.