Emu XL-7 & MP-7 User's Group

Which one should I get?
 
Basically, I wanna be able to do everything I can on my PX7, plus have access
to sampling and some mastering ability.
 
What I have currently: PX7, midi'd thru my Yamaha DX keyboard, and Wave
Creator software to put on my computer.....that's it.  I use my PX7 by itself to
construct tracks.  The proteus cost is pretty attractive, but I wanna know from
some of you 'undergroung professionals' what to do.  Oh, and my computer has
more than enough memory to house either piece of software.
 
HELP!!!!

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