Hmmmm I'm a newbie to painting to but my advice is pretty much opposite everyone else's. I use either testor's acrylic or model master paints.
Sometimes what I do is wet the paint brush with water, dry it a lil bit on a blue shop towel and then paint. You have to do several coats with certain colors but it leaves no brush marks. Silver for one takes 7 coats. But this is just my way.