First off, welcome to the site.
Just a thought: when was the last time you removed the oil from your balls? I suggest the hot water soak with a little dish washing liquid. This should return most of the ball's performance.
If you still want to replace your equipment look at this site. http://home.earthlink.net/~litefrozen/index.htm open the link ball reviews. This spreadsheet compares all balls manufactured over the last number of years. You can find the specs to yours and compare them with other listed balls. This will give you a good idea how they will perform with a comparable drilling to what you now have.
Good luck.
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