I'll be playing games like Battlefield 4, Planetside 2, The Witcher 3, Grand Theft Auto 5, Arma 3, etc... Using Windows 8.1 64-bit, Roswell 750w PSU, 8gb Corsair Vengeance 1600 ram, and ASUS M5A97 R2.0 mobo. I also have a project studio setup in my home and will be using it for recording/mixing music. I imagine the 8 core cpu would be better for those related tasks, but either should still be a big improvement over the FX-4100 that I've been using for years, so I'm mainly just concerned with the performance as it relates to games.
DOH! It occurs to me that it would be very helpful if you knew which GPU I'll be using. Not entirely sure about that yet as I plan to get that around Christmas as well, but it'll either be a AMD R9 280X, a GTX 770 4GB, or a GTX 760 2GB (if I'm forced to skimp a bit on price due to unforeseen events).
Both R9-280x and GTX 770 are very good cards, but the GTX 770 4GB is a lot more expensive than its standard 2GB version.
Get the R9-280x. If you were to get the GTX 770 4GB, might as well grab a R9-290, it's faster than both R9-290x and GTX 770
Video Card:Sapphire Radeon R9 280X 3GB Video Card ($298.99 @ SuperBiiz) Total: $298.99 (Prices include shipping, taxes, and discounts when available.) (Generated by PCPartPicker 2013-11-28 23:43 EST-0500)