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

Hello.
I want to get a MP-7 and found a few.
1. A pawnshop has one for $395 basic unit only. 
2. A guy on Ebay who lives in my city has one on Ebay for $200 so far,
basic unit only.
3. Also on Ebay, a person has one at current bid of $315 fully loaded
with cards, hard copy manual, light, and software.
3. The Guitar Center has one for $499 and it something called a SIG
card. I played it and it sounds wonderful and has a 30 day warranty.
Another customer in the store was playing it and says he has one and
it is on par with an Akai MPC in capabilities, but no sampler. He
suggested  I get that one because of the SIG card and it has sounds a
basic one does not. 

After looking at other drum units and synths, the MP-7 is money well
spent because of the sound module, drum effects and programability.
Also, I can use it live for sounds, drums, or both. 

Which do you all suggest I go for?
Thanks.