jsattv, from my location (84.0w), I'm able to get from Hispasat @ 30.0w to IA7 @ 129.0w, with no problems. I'm using a Stab HH90 with USALS on an 80cm dish and a Stab HH120 with USALS on a 1.2m dish. Both will go further west than IA7, but there's no ku for them that I can find. I've tried to get 148.0w a couple of times, with no luck. The Stab motors go about 55-60 degrees in one direction with USALS, from your true south location. I'm told I could go further with 1.2 settings, but I haven't tried them. I've read the SG2100 will go 70 degrees in one direction with USALS, but I don't have an SG2100 to confirm that. If you know your true south location, this might give you an idea how far to look? Good Luck!
Al