Rosetree, I trust your judgment and your ears. If you say that the SRX-04 and SRX-10 "largely live up to these Kurzweil sounds", I believe you. Getting a Roland Integra-7 is certainly cheaper than a PC3K/A, so I'll certainly keep this in mind when I'm ready to buy.
Well, thanks a lot for your trust, but it always remains a subjective thing. This is my impression from overhearing these demos all in all, but to be sure about the individual quality of Kurzweil sounds and the range of different samples, I would have to try a PC-3 myself and go through the voices and samples, including the available expansion(s) (I've read about KORE64). I haven't ever tried a Kurzweil in a store, so my judgment is really just based on these demos.