As for me, I don't know if in PS3 store wouldn't be any upgrade, I see little expensive to pay same game two times, even with new things, it's a good strategy to get money.
As for me, I play Tekken Dark Resurrection Online from playstation store, since it is cheapest and smoothest fighting game on PS3. I haven't played Street Fighter, but I would be staying tuned to PSstore and don't buy extension yet>