Many teams do not realize this until it's too late: if you do not gear low enough, you might have the finest top speed in the world but your robot will work terribly. A four wheel drive geared too high will never turn (save usage of ominwheels). But even still, some robots, particularly in games with frequent changes in acceleration (as this game will probably have) manage to keep the fuses warm just by driving them and they quickly break as soon as they stall.
I speak from experience with a drivetrain last year, that following the breakdown of it's planned 6 wheel/tread drive and conversion to 4 wheel drive, suffered these very problems. Omniwheels let it finally turn, but nothing could stop it from popping breakers frequently. And this was only at a 1:2 gear up from the kit transmission. To be fair there probably were other things wrong besides the gearing.

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Team 694
2005 Championship - Galileo Semifinalist
2005 New York - Regional Chairmans Award
2005 New York - Semifinalist (Thanks 1257,1340)