I5-460M vs i7-720QM for Photoshop CS5 and Lightroom 3?

I would stick with the i7-720QM because it has 4 cores and can thread up to 8. Plus, I think you can overclock i7-720QM, but I'm not sure. You will definitely need the 4 cores and 8 threading processor for Photoshop and you will notice a big difference when compared to i5-460m.