I've been using the callaway diablo and callaway warbirds. I like them quite a bit, I think I favor the diablo a little more but there isn't that much difference, to me anyway.
And they don't break the bank.
I also will play a hole or two with balls I find on the course to get a feel for different brands. I found a brand new looking pro V1 by a bush the other day and man I could def. tell a difference in the "feel". Played a Nike tour one and didn't like it at all. I also bought a pack of sirixion that I like quite a bit.

but they were kind of pricey