Jorge: I brought a Columbia Rival (1000 grit abralon polished w/Valentino's Snake Oil), and a Lane#1 Cranberry Buzzsaw (NIB finish, which I believe is 1500 wet sand, highly polished). And of course, a plastic spare ball.
I used both the Rival and Cranberry, depending on lane transition. The problem I had with the Rival is that it tended to set up too early (for me) for the tighter line I was forced to play. The Cranberry gave me a more comfortable push through the heads, but it didn't have enough surface for me to carry strings when the oil pushed down.
Someone else said that the best ball to use was the one you left at home. First, if I had to do it over again, I would have brought a few additional balls along. Everybody is a little different, and it's better to have choice regardless of how you're told the lanes play.
In my case, I would have also brought my Hammer Black Widow Bite and Lane#1 BuzzBomb. I think the Bite (4000 grit abralon) would have given me the push through the heads I got with Cranberry, but with more drive when the oil carried down. The same with my polished BuzzBomb (Valentino 800 grit Resurrection followed by Snake Oil). I needed something with more push than the Rival that had some backend, and I think either the Bite or BuzzBomb would have done the trick. Whatever your arsenal, consider having the choice of aggressive lower-RG and higher-RG reactions.
jbrun06: Two of my team partners were getting fairly deep, sliding just to the right of the left gutter. Even though they were deep, they were still playing a fairly tight swing into the pocket. No matter how much hand you have, you can't create a large swing area to the right.