OK, I'm trying to get this all figured out. Too much math.
If someone plans to get all 3 of those big titles (ME2, LBP2, DS2), which of these scenarios is better:
Buy LBP2 & get DS2 at 50% off, plus a $20 PSN card. Then get ME2 by itself a week later, on sale for $45
Buy ME2 right away, and...