As of today there is NO game that demonstrates a technological advantage that would equate to a $200 price difference...
Answer me this; How many games do you see utilising the maximum potential? And what number will deem the extra $200 worthy?
You shouldn't be able to get a game like Gears of War 2, which looks better than (i'll be generous) all but 5 PS3 games on a machine that's $200 cheaper...and no we're not waiting for next year - you told us that last year.