The 640 will not pull 60fps except at very low resolutions, and will struggle to hit 30fps at 1080.
Try looking around for a GTX 570 or go for a
GTX 650ti, they will comfortably hold 60 on most current games.
Invest in a cheap
i5 processor it will do the business.
Case, you can go as cheap as you like really.
HDD, again, I would recommend going for something like
500gb-1tb, depending on price (sometimes, 500gb HDDs can almost be as expensive as 1tb HDDs); it's more than enough for an OS and some games. Going for more HDDs will add cost, but can be better suited if you want to record.
For a PSU, I would recommend a fully modular (though hybrid modular or non-modular may suit your needs) of at least 650 watts.
Go for the cheapest optical drive you can, as this component really doesn't matter in the days of digital downloads.
For RAM / mobo, it's personal choice... solid mid range choices will give the best value for money, and under investing will lead to predictably poor performance.
EDIT: For $700 dollars, you won't get much, and I would be dubious as to how well it will play up and coming games... You don't need to buy a complete package either. Better to get the components you want over a few weeks / months and build a PC that will work than buy a ready made bundle, particularly when it's packing a 640 model GPU.
Modifié par Annomander, 06 septembre 2013 - 10:29 .