Gaming - go with intel. I don't know how many times this has been said.
Get a less expensive PSU and a better GPU.
nikorr suggested this in another thread. Then you can think HD6950 or GTX560Ti.
For about the same price you should be able to pick up a 2500k and a Z68 board which will do better than the 8150 in just about everything so its definitely the better choice.
You went for the top shelf PSU but only a lower mid range GPU, drop down to something like the 750 TXV2 or one of the XFX 750 W units, they are still good units but will save you about $60 which can go towards a better GPU like a 6950.
I do agree with the post above. The PSU that you have selected is a complete overkill for that system. For some reason people think that more power gives them a better computer.. it does give you a bigger electrical bill, that is about it for a normal system. If you want a well balanced system I would personally go with a AMD system to cut done some prices and get a SSD and a better motherboard. I would recommend going with the AMD 7-series graphics cards.. 7850 or higher. If you have anymore questions please let me know.. I build computers at work all the time! (I do build Intel systems because we do not really have a budget and we need the absolute best!)
This is a quick build that I just made. It has a smaller hard drive.. but it will run much faster then the Seagate.
Do some research on how to get Windows 7 for free.. and purchase/use a USB flash drive or a usb disk drive to install windows. AND.. if you get the FX-8150 follow my overclock guide at the link below to improve the performance by 15% by disabling.. 4 of the cores!