I agree, pss makes a lot of sense. Maybe you should try to figure out where he got his deal...
The only thing I may disagree with is about the warranty. Phase offers a great warranty. Expedited service all over the place, cross-ship hot-swaps when needed, better case and extra battery AND a free camera mount switch within the 1st year if you want. Plus, if you do upgrade in the warranty period, the warranty starts over, so you don't have to worry about "using it all up".
What kind of stuff do you shoot? Is speed an issue? The P21 is a fast back, so the P21+ seems to make sense, since it will eliminate the buffer issues.
If I had to choose between EITHER the warranty or the + version, I don't know what I'd do... I shoot fast. Well, I'm glad I'm just sellin em now and don't have to decide on that one. Definitely try a P21 out before you buy. That will tell you whether it will do the job for you. And if it does, I'd say go for the P21 value added.