Bill, If you get one that you can upgrade later, you have the best of all worlds. the greatest benefit I found though with the upgrade was the larger RAM, allowing me to store more music on the pad.
Bt the way, don't let your drummer near the pad. I am very careful with mine. Although I carry hard copy around somewhere just in case, the truth is that I have made more and more annotations to the music on the pad that is therefore not on the hard copy, so I am increasingly dependent on it.
Graham
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150