New Fishfinder: Need help with maps

Last weekend I got a steal of deal on a new Humminbird 788ci xd. As some of you might of saw gander had the 788ci on sell for $250 off, but the first day Little Rock was sold out, Jackson, TN was sold out. So I called Paducah, KY the guy said he had two I ask him 3 times if this was the one on sale in the flyer he assured me it was and that he would hold it back for me. Drove from Jackson the next morning to Paducah got there and guess what they were out to the 788ci and they had put me back an xd. After about an hour they sold me the xd for the sale price of the ci and I didn't even have to send in a mail in rebate. Bass Pro did the same thing last year but they sent me home empty handed. Guess I lucked out this time.

So I said all that to get to the question. This unit will take Navionics Gold and Premium. Which would be the best for Greers and Dardanelle? And is there much if any noticeable difference between the chips from 09, 10, and 11.

Thanks,

Michael