I have had a look at the specs for the PSR-540 and they seem to be quite good (no modulation wheel, though). Unfortunately it does appear to be way out of my intended budget. I'm mainly a guitar player (and crap at that) who wants to play around with some backing keys...

I could look at the 340, but then I lose the XG support (which would be a selling point) and still pay for the floppy drive (which I could do without, to be honest).

The budget constraint is the reason I was up for either the DJX or the Casio CTK631. I know you're all rabid Yamaha fans, but I read somewhere that they actually have improved the wave synthesis on this casio model compared with older models, and increased, for example, the amount of sample space for the piano threefold.

Can this particular casio model be that bad, or is it just lack of street credit (which I can live with, to be honest)?

And, quite honestly, is the DJX any good for anything NOT dance/trance/goa/rave?