It's not worth it to gamble on something else imo. Search here, as well as the other forums, you'll see plenty of threads on what can happen to your water pump if you use the wrong stuff for too long.
The PO of my car used regular antifreeze. As a result, I had to replace prety much the entire cooling system: T-stat, Radiator, Water Pump. (also the fan clutch, but we can all agree that was unrelated.)
So, I guess you can take your pick: $20-$30 now for the blue stuff, or $200-$300 later for a new cooling system.
Brian