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

I've been scouring the web trying to find this answer and so far can't 
seem to dig it up. 
My question is: How many of the ROM Boards did EMU make for the PK, XL 
and Proteous 2000 series ? 
Also, Is there a list of the patches and wave forms that were on these 
boards ? 
That would be great if I could get this info. 
Also which is the rareist of all boards at this time ? 
Is it Beat garden ? 

1 more thing, Is ther a valuation of the various boards out there (Not 
on prepal.com) Or does one just need to check Ebay frequently for 
pricing ?

Look forward to getting some answers on this topic.

Regards,
Vic