If you're getting the "cup" style oil filter wrench, bring your own filter. With my Mazda, I didn't have my OEM filter on hand, so I used a FRAM replacement at the auto parts store, the wrench did not work when I got home. Needless to say, some after market filter brands are not the same diameter as the OEM filter.
I have a Craftsman adjustable claw one just like the one rook posted. The only negative about an adjustable wrench is it requires two hands, one holding the wrench until the claws get a "bite" on the filter. On the bright side, it'll be the last oil filter wrench you'll need to buy.