CS5 has some really awesome features, but the brush choice is just horrible. I cannot find 1 single splatter brush set. I'm having to use C4Ds that look like splatter brushes, and it's a pain in the ass to move them around to get the same effect.
I was trying to do a simple splatter brush/clipping mask for part of a sig, and it was just a pain trying to compensate splatter for c4d.
My opinion, stay with CS4 for a long time, or until they get more brushes.
If you do find any Kry, I would appreciate a link, it is very disappointing.