Bebop,
I've you haven't had your question aswered regarding expansion cards and blank memory cards, I will give you some answers.
You can buy a PCMCIA to flash card adapter ($9.95 at Fry's) and any size compact flash card. I load about 2500 roland styles, 2500 standard midi files and can load lot's more onto this memory card.
I have installed two SRX expansion boards (world and studio) into my E80 at my store. By pushing the EXP button next to the voice catagory burrons, I can toggle between all these hundreds of new and different voices.
You cannot use the cards (SRJ) out of a JV880 because these are not compatible. Only the SRX cards will work.
I hope this helps

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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com