I second Birdzilla's suggestion of the Best-1 feeder. They represent a good value and are very durable. We take ours on vacation each year where it gets a very good workout. Some years we have had each "station" occupied with several hummers awaiting their turn. Never have we had a situation occur as described on the link, and the hummers don't seem to have a problem feeding.
Drifting off topic...We have had some recent trips where we had the Roufus hummingbird. This bird proves to be a real pest. Often chasing off the other hummers and feeding very little itself. Does anyone have any experience is making this bird feel unwelcome? I have resorted to a flyswatter, but it doesn't seem to deter them.