Alright. I spent a little bit of time putting together this part-list. I've also taken in the fact that you live in Australia, So I did it off pccasegear.com, an Australian website.
You could easily save ~300$ getting 3570k and 1600mhz Ram which are 100% same performance in games. (Same cpu, 3770k has extra threads)
Ideally you want 1.35V ram for ivy Bridge as it won't put any strain on your memory controller (Which is the reason some MoBos die suddenly). Also lower timing impact more on performance than higher frequency.
In games the extra threads provided by 3770k will just sit idle as they are not optimised to work. Also it will run hotter.
You're right about the gaming part, but if he has the $2000 to spend and wants to do some editing and rendering at any point, they will be well worth it.