Ross- good choice! I was about to jump in with a recommendation for the true gravity fed brush as well, but you beat me to it!!! I think you can't go wrong, they're very easy to clean.. able to do detail at lower pressures and less overspray. If you are only going to use a small amount of paint, just put a few drops in the cup and go to town! I've painted with as few as 2 drops of paint in my Iwata for small things with no probs!
And as long as you treat your brush well, the needles are not fragile in the least. Let it drop nose down on your desk and it's a different story! ![Wink [;)]](/FSM/CS/emoticons/icon_smile_wink.gif)
I used to be stuck on bottom feed but I am a convert now!