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

Sorry to ask another ROM question.  After combing 
through the posts on this list, I have decided the ROMS I would like 
to have in my MP-7 are: Protean Drums, VIntage Collection, and Pop 
Collection.  Are there three or four total slots?  I think I would 
like to get rid of my mo' phatt rom.  It doesn't suit my style of 
music.  If anybody is interested in a trade let me know.  
The question is, which ROM to get first.  Is EMU going to discontinue 
these soon?  Will some dissapear before others?  I have an Alesis QS 
that handles the bread and butter sounds ok, and an ion that does 
vintage stuff great, so the Protean ROm is probably the most 
essential, but if some of those ROMS are dissapearing soon, should I 
jump on them first?

Thanks