Some companies make underdrive pullies to underdrive most accessories but have a smaller pulley for the alternator (spins faster) so that it charges normally because it spins the same speed (slower crank pulley/faster alt. pulley = same speed) and i think on some that have that, you can use the stock size belt as well. That's the kind i'd personally get, but you won't get as much HP gain with it as one that underdrives the alternator as well.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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