Very little current software uses six cores. And software coming out now also does not use it. Software projects that are starting now are writing it for n-core. So if you want a life of 3 to 5 years for this system, I think that you will get a boost at the end of life for your system that will help it get to five years and maybe more. If you are going to build a new system in two years and sell this one, you will not get much use from the hex-core processor.
I built my system two years ago and I got the Antec 900 case. It's a good case, but if I had it to do over, I would go with the 902. I think this is a good choice.
You didn't say what Power Supply you are looking at. This is an important part of the build.
Also you say "1TB Hard Drive" . Which hard trives are you lookng at? I have a WD Black. I can't really rate this drive as you have to have hundreds of them to really rate it, but mine works, seems to be fast, is not noisy, and does not run hot.
Ok thanks for advice. I have been reading that the hexacore is not much use now, and like you said i was hoping it might come in handy couple of years down the line when programmes are using more cores, also i will be doing some video editing so thought it might help there. Do you think i might be better off getting x4 955 for 100£ cheaper, then dropping in a hexacore when prices drop, and when it is needed. Also power supply i dont really know as i dont know what to look for. This is one i was considering. Corasir vx550 w. I think it was about 650 watt. Also what did you think about the 460 sli on a amd board, is that a viable option. I chose to go with nvidia so i have the option of playing 3d games if i decide to get a 120hz monitor.
Sorry, forgot to mention, Hard drive is a 2TB Western Digital 64MB Cache 7200rpm SATA 3.0Gb/s internal Green Desktop Hard Drive. So not 1TB.