did you bother to ask him if he wants to overclock? if he has no plans to do so you just suggested he spend more money for something he won't use. 16gb is a waste if all he is doing is light duty gaming. you wouldn't even come close to needing more than 8gb for Crysis 3 on ultra. I will agree that the 7850 is a nice card, but we have to look at what he wants to do and games he want's to play, and his budget.
an Ivy bridge I5, with an 7850 won't leave much room for quality in the rest of the machine. if he really has his heart set on an intel machine i would suggest an Ivy bridge I-3 (or better yet just wait until intel releases Haswell) and a 650 Ti. that will leave money for a nice quality modular psu, mobo, an Intel SSD (which imo are the best ssd's on the market), and perhaps a nice case with room for cable management.
---------- Post added 2013-01-14 at 11:58 PM ----------
if you are talking about a single gpu you are correct. however there are some AMD mobo's that do not support SLI, while the same boards have full support for Crossfire.
and for the second bold. you will only find PCI-E 3.0 on intel boards currently, but as we aren't even close to fully utilizing PCI-E 2.0 yet AMD has not launched support for 3.0 yet. the difference between 3.0 and 2.0 is more bandwidth that you won't use.