Having owned and used about half dozen modules and arranger boards over the years, I can tell you that the Genesys XP is the closest you'll find to the PA800 in terms of features. In addition to coming equiped with the abilty plaback mp3/wav/midi files, has an on board recording studio and a 20 gig harddrive. You can actually burn your own CD's from the module. The XP's styles are good but not near the quality and/or quantity of the PA800 but certainly on a par or better than most of the other modules. Like the PA800, you can edit styles and create user styles. The XP is certainly worth looking into.
Ciao
Jerry