Here's a link:http://www.notebookcheck.net/Mobile-Graphics-Cards-Benchmark-List.844.0.html
I don't see a listing for the GT530. If it is new, then I would have to know more about the chip.
The CPU's are a bit of a tossup. I would expect the i7 to be slightly faster but then you may take a hit on the battery life.
In addition to that webstie I mentioned, PCWorld.com also does many laptop reviews and I would try to find reviews on the specific models you mentioned.
Many times two notebooks with identical specs perform quite differently, and there are of course other things to consider as well, such as screen quality, ease of use, and keyboard comfort.
Toshiba's are typically great business class machines, but it depends on the model.