Though it would be very nice to have a chart like that on this website I normally go with the BTM (Bowling This Month) spreadsheet that's created every several months for good ball comparisons from the magazine. Since I also throw Track balls the speadsheet is a good way for me to compare between the two companies so I don't overlap in my arsenal. Plus it gives you a rating depending on if you're a stroker, tweener or cranker as well as using it for a sport pattern. Here's the link to it:
http://www.bowlingtracker.com/forums/sh ... .php?t=527