well mx18 has 580m in SLI so it actually *should* be faster but not sure $500 better I would say go with the mx17. Even 16 gig is not need for gaming not to mention 32gb.
Yeah, I'd try to negotiate some of the 32GB off, I definitely wouldn't need it. And I heard that the 580m is indeed faster in SLI, and the 2960XM definitely is.
Do you think that the m18x would be a better deal IF they were the same price?