I would go for the G.Skill here too...And next month I would buy a second to pair them up (as long as you are looking to put this in a dual channel motherboard.
Having 16Gig of RAM is not 'really' needed, but at that price...why the 'bleep' not!
Plus, if your mate does end up taxing the PC through the use of lots of software then the additional boost you get from the dual channel is great (if you are trying to get as much umpf out of the PC as you can on a tight budget)
What CPU are you putting in the box? and what otehr components now I think of it....would be useful to know so as to suggest tweaks, etc.