Thank you for the reply.
I've had two different recomendations for my purposes: a gravity feed, and a siphon feed. The siphon feed was recommeded because it can hold larger quanities of paint, so now I need to find out why several people have also recommended a gravity feed; what are the advantages? Are they easier to clean, easier to maintain, easier to understand from a beginner's viewpoint, etc...?
I'm just not sure which one I should lean to without knowing the advantages and disadvantages of each with my specific purposes in mind...