[dmjlambert]

The more modern the car, the fancier and more expensive the accessories. You took the plunge when you upgraded to the serpentine belt and bracket system with accessories. I sure would like to do that.
I think once you get the resistor in the circuit and get things going you will probably love the alternator. When I looked at the tons of "help I just fried my CS130 alternator" posts on the internet, especially in all the Camaro forums, my perception of the research others have done very often boils down to GM used a 510 ohm 1/2 Watt resistor on the L wire in the various adapters or pigtails GM sells for $20 to $40.
If I were in your shoes I believe I would get parts to match the 89 Blazer because that is where the serpentine belt and bracket system came from.
I first upgraded to a cheap Chinese 12SI alternator, which is a V-belt alternator, and it only lasted a year. Then I did lots of research and decided to take the plunge and get a CS144, which is very modern and came with a serpentine pulley installed, but still somewhat compatible with my V-belt bracket and pulley. I had to file the top adjuster bracket to make the groove a little wider.
I still have all my original wiring, and used adapters to wire the alternator. At some point I will probably unwrap the factory wiring harness and replace some of the wires and solder and shrink wrap the resistor directly into the harness so I don't use adapters any more.
I believe I've paid for the last alternator this truck will need me to pay for, because I got a lifetime warranty one from O'Reilly. Unless I do a serpentine belt system swap like you did, then I'll be back to no warranty and good to go for as long as the donor alternator works.