My local fun shop just got in the PPX. They are selling it for $339.00, plus a mail in $50.00 rebate. I examined one and have to admit the pretensioned DAO is really nice. Otherwise, I don't see anything to recommend it. It's bulky, has an odd grip shape, and looks like a Hi-Point and a Walther P99 made a baby. Being a Walther that's not a PPK, parts and mags aren't going to be cheap or easy to find.
Have you considered the S&W SD series? They are the same price point, stainless, and come with two mags.