Jerry makes some good stuff. 650 though? glad I got mine when I did! (what's it been...2 years ago now?) are you making them from all CNC now, or still using modified magnum brackets?
Here's a picture of the kit I bought from him, it runs a stock magnum alternator and A/C pump, a Jeep PS pump, a GM belt tensioner, and adapters to put magnum pulleys on the water pump and crank.
I like it!
(Mine's even on a Dakota too!)
The only other options that I know of are A) the cheap kit that simply replaces your pulleys from V-belt to serptentine, and still uses 2 or 3 different belts like the old school V-belt systems.
or B) the 2500 polished chrome version that is 100% custom and all aftermarket.