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Mike,
I too own a 3D and an HQ Feather. If you are looking for a good kite on the cheap, the Feather may be out of your range (You can get it on sale for $120 or so, but I think it lists for close to $200).
I never flew a PI. When I bought my 3D I was considering the PI. Based on the responses, I think I will need to get one. Pros of the 3D - it is cheap (<$79). It flies best in low wind (1-2mph). Can handle gusts (I've flown it in 12mph wind but don't recommend it). It is very trickable (multiple axels, floats, fades, 540s, 360s, slot machines, lazy susans, etc). For a light wind kite, I think the only limitiation on its trick range is reflective of pilot ability. I have had no construction problems, but have heard that earlier versions of the kite did not have a reinforced nose or tips (that could be why Jamey had the problems he did??). If you do pick one up, you'll want to add a patch (insignia tape) where the top spreader crosses the spine - even a UL will where through the sail after a while)
Cons: if you are learning on it, it is tricky. low/no wind you are going to need to walk and pump the arms a lot until you get the hang of it. The standoffs can be lost, but they allow you to tune the kite for different conditions. I fly the kite on short lines (15-25 feet) and love it. Depending on the season, it gets more use than any other kite in the bag.
From the sounds of things, I don't think you can go wrong with either the PI or the 3D. Try one, and if you get hooked and can swing the finances get another in time. Just don't get frustrated at first. small ULs on short lines in low wind take some getting used to.
Good luck!