Believe it or not, mobility 5850 is more powerful than 260m, despite it being cheaper. I'm not even talking just a little better, 5850 completely topples the 260m. The next card down, the 5730, performs on par with the 260m, for $150 less. Only about 1 in 20 games support the eight threads you get from the i7, if you get the i5 you'll only lose one or two frames per second in even the lightest games, but you'll gain $100. For gaming, there is no discernible difference between 1066 MHz DDR3 and 1333 MHz DDR3, but if you plan on messing with programs like after effects or something, then I would suggest keeping that option.