Starcraft 2 can only make use of 2 cores so any more cores is worthless for that game unless you have a high end i5 or i7 processor that can use unused cores to turboboost the clockspeed.
You should not be considering ANY Sony VAIOs unless it is through this $200 or $400 off deal.
http://forums.redflagdeals.com/sony-...-500-a-924013/
Quite frankly, the F series VAIO customized with 128GB SSD and i7-720QM CPU for $900 (After $200 coupon) is the best money can buy if you want the Sony route. All the brick and motor store VAIOs will not give you this discount or the SSD which makes all the difference in the world. The cheapest i7s I've seen cost $1500 at Bestbuy and London Drugs.
Choosing a laptop is about the whole package, not just the CPU. You need to consider all other things so if you have other alternatives, it would be best to look at everything in perspective.
***edit sorry looks like deal is expired or something now, I can't add it to cart.