Given the constant heat source that the i7 is under load, I only can nod to the i5.
However all these are not laptops but desktop replacements. Yes I've hear it before that you are willing to lug a 17 inch laptop around but are you OK with the short life spans?
Buying laptop for college...Looking at three laptops at best buy all in similar price range
Toshiba Model: PSBY5U-01K | SKU: 2850801
Dell XPS Model: X17L-781ELS | SKU: 2817237
Sony Model: VPCF226FM/B | SKU: 2794192
they are all similar..which brand is more robost...durable ..less chance to over heat?