Audiogoon,
Cool handle!
As to your question, your table and arm now easily outclass the cartridge. If your budget can afford it, go for it. You definitely have a setup that will allow you to hear the difference between the glider (a good cartridge for the money) and a great cartridge.
Also, I believe the Graham 2.1 is upgradeable to a 2.2 - thought by many to be the best pivot arm out there. I don't know if you would hear much difference, but if it doesn't cost too much, you might consider that also.