Aha! You're ordering shocks! Haha got you thinking about it and here we go. Of those 2, I'd def have to recommend the 9000s. Def don't want to cheap out on shocks or it'll be no better than it is now. Try to find a monotube if you can (most are twin tube) The mx6's I just ordered are the only monotube I could find but dude go to 4wheelparts first!! Click on shocks, and then "shocking deals" and they have great prices on 4 shocks...Mx6's are usually $100 a piece but you can get 4 for right under $350 and they have the 6 way adjustments, monotube, pure awesomeness..They also have killer deals on the bilsteins and a bunch of others!
Above all for your application, I'd have to recommend bilstein 5100's to be honest. Best bang for the buck by far.