[MovedGoalPosts]

For the majority of today's games, and probably those of the forseable future, graphics is more important than the CPU or RAM. A modern i5, with 8 GB RAM will more than suffice. You do need an SSD for reasonable loading times, and ensure that is on a SATA III port on the motherboard. If running at standard HD 1080 resolutions the 770 will suffice but with 2GB RAM onboard it will be the thing that limits your future proofing. at the moment my GTX 670 is holding it's own, but in games like Battlefield 4, I can see times on the ultra settings that it doesn't quite cut the mustard. Thus if you can get a higher card, you'll probably be happier long term, if you can keep to a budget.

The K version intel chips do offer the overclocking versatility that is worthwhile if you will keep the base PC for a few years, even if you don't need that resource now. But it isn't essential as by the time you think things are too slow, then everything will probably be getting on a bit that you are trying to prolong the life of something that had become frustrating. Realistically I have an i7 2600K at stock speeds and that isn't being put under any pressure, and I know plenty of people with the i5 CPUs playing current games that don't have concerns.

To be fair a price in the £900 is a fair amount, especially if you consider the cost of the next gen consoles now out. There are diminishing returns spending much more than this, and many will baulk even at that amount. Within the NTHWgaming clan it's few who would be able or happy to have a PC of that spec.

The case you are using isn't that spacious. Be certain the cooler and your graphics card can fit properly. A micro ATC board may compound the tight fit issues, especially for mounting any non stock cooler. Be very carefull that a closed loop water cooler, if that is your choice, can fit as the radiator plus fan is quite some depth.