underdrive pulleys on the cheap

For those of you wondering...
Factory balancer is 7inch dia, water pump pulley is 6.5 inch dia and alternator is around 2 inch dia
This means at 1000RPM (crank), the water pump is going 1077RPM, the alternator is going 3500RPM
If you put a large diameter 'hemi' pulley on the alternator (3 inch dia) the alternator RPM drops to 2335.
Changing only the small crank pulley (5.25 inch) the water pump RPM drops to 800 and the 2 inch alternator drops to 2625 RPM while the 3 inch alternator drops to 1750 RPM.
With the small crank pulley and the extra large water pump pulley (7.125 inch) the water pump RPM will drop to 740 at 1000RPM crank speed.
Make what you will of it, these are just the numbers.