1:- is it worth getting an i7 instead of an i5?
personally i'd say definitely, but then again you wouldn't notice the difference between an i7 and i5 in most things people use a pc for and that includes playing most games in my opinion (not a gamer myself.)
2:- is it worth paying more money for an after market cooler?
again personally i'd say definitely, especially if your going to put any type of overclock on the pc.
my cooling system for my own old type i7 cost about £250
personally i'd get a more powerful psu especially if your thinking of going sli any time soon, you'd need at least a good high quality gold standard 750/850 watt psu.
case and everything else looks fine, maybe not my choices, but nothing really wrong with them, in my opinion.
about the only thing i really really don't like in your parts list is the hard drive.
it's definitely going to slow down the system and make the rest of your performance parts seem like a waste of money.
the green 5400 rpm drive makes for a good data storage drive, for things like your media collection or a data backup drive, but it makes for a very poor performance/os drive in my opinion.
minimum speed drive i'd get is a 7200 rpm drive, and to make the best use of the rest of your parts, i'd highly suggest getting a ssd for the os drive, probably around the 120GB size mark minimum, then you can use the green drive as a 2nd data storage drive if you liked, but again i'd prefer a 7200rpm 2nd drive and i'd only use the greens for backup drives or storing my video collection.
Edited by terry1966, 08 November 2014 - 02:11 PM.