I would wait for the PA800...
Lots of reasons including the new OS2 features/sounds.
Also, dowmload both manuals and look at them closely. I heard that the programming features are cut short on the PA500, but I don't know that to be true personally...I just read it somewhere...If your like me and want lots of programming features then it might be a showstopper.
I have the PA2XPRO...I like it a lot.
Lee
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Lee S.