rmattingley,
I have an '00 Grand Am GT with 102K miles. Around 90K, a wine devoloped in the steering unit. When I hit 100K, I used a turkey baster to suction out the fluid from the PS resovoir. When I filled it back up, I used Valvoline SynPower PS fluid. I also added an ounce of Auto-RX. 1000 miles later I did the same thing. Right now the wine in the steering unit is completely gone and the steering wheel is MUCH smoother overall when making turns. Even if you don't have some Auto-RX to use, my vote would be for the Valvoline SynPower PS fluid.
EDIT: I just realized you already went with the SynPower fluid. Good choice. Glad to hear you already getting positive results.