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Vic, before you rush out and buy sprockets consider going to a smaller chain size from stock.
The 250 Production folks who race EX250s have found that going from the stock size to a 415 or 428 chain and sprocket makes a noticeable (about .5-3/4hp IIRC) change on a Dynojet acceleration-type dyno. Obviously, the difference is not from an actual horsepower increase, but rather that the parts spin up quicker which the Dynojet sees as more power.
So you'd get both a bit better acceleration and a small reduction in weight, some of it unsprung. For the type of use you'll be giving it there shouldn't be significant longevity issues from the smaller chain/sprockets.
cheers,
Michael
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