hows this??

Looks like a good deal, but its only stock gearing. You won't notice any difference than your current gearing. If you want more top speed but less acceleration, get a smaller rear sprocket. If you want more acceleration but less top speed, get a larger rear sprocket.

For front sprockets, Larger is less acceleration but more top speed. Smaller fronts are more acceleration but less top speed
 
When it comes to gearing it's a trade off. You get one or the other. If you want top speed and acceleration than get a 14 tooth front sprocket and get your cylinder ported.