Hi kennel, on reading your first post my first reaction was a question: "Which quad core processor exactly?"
You answered that in your second post. Best advice I can give is to definitely steer clear of the 8-core processor - the extra cores will really not be of very much use in gaming or most applications for the foreseeable future.
Also, the AMD FX-4170 is off the pace of the current Intel processors.
To get an overview of the current state of play read:
http://www.tomshardware.com/reviews/...ock,3106.html?
and check out the Gaming CPU hierarchy Chart at the end of that article:
http://www.tomshardware.com/reviews/...ck,3106-5.html
Current best advice is to get a Core i5-3570K. This will mean you will have to pick a different motherboard as well.
Regarding RAM, I think 8GB is plenty for now, but some people prefer to max out with 16GB. Most tests I have seen report absolutely minimal (if any) performance gain from that though. Just make sure that whatever motherboard you get has the capacity to add extra RAM later if needed.
I think you will not need the 1000W power supply unless you feel that you may double up on graphics cards at a later date. Current graphics cards are a lot less power hungry than those from a few years back. With your currently quoted system I would say a
good quality 600W would be fine, even if you decide to overclock.
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Edit: Just took my own advice and read the article I linked to! The AMD processor is about $100 (US) cheaper than the Intel, so if (?) price is a really key factor in your choice you may decide to opt for it, BUT even with price considerations for max performance my advice would be to go for 8GB Ram instead of 16GB, opt for a 600W power supply then spend the money saved to get the Intel processor.