drojman :
With regards to Hex core and Quad, are Hex Cores viable yet, or are Quads still more than good enough?
It's mainly AMD utilising six and eight cores, however their single-core performance is not as great as Intel, regardless AMD's 6-core offering does perform outstandingly, whereas the FX 8-core are not as great (the FX-8 series are actually quad-core with 8 threads/logical cores.) A quad-core processor is still viable, however more performance can be gained through more cores; regardless Intel has opted to stick to four/quad-cores, and another 4 via Hyper Threading: 4 cores and 8 [hyper] threads, thus the OS sees 8 "cores." Keeping in mind, Intel does provide a better performance over AMD even with quad-core and 8 threads; heck, even the i5's outperform most of AMD's offering.
Intel i3's are dual-core with Hyper-Threading (HT) thus, 2 cores 4 threads (OS sees 4 cores.)
Intel i5's are quad-core with 4 threads (OS sees 4 cores.)
Intel i7's are quad-core with HT thus, 4 cores and 8 threads (OS sees 8 cores.)
However having a core is better than a thread, hence an i5 performs much better than an i3. If Hyper-Threaded, a single core has 2 threads. Regardless for gaming, an i5 is more than enough but you can bump up to i7's or Intel Xeon E3's (the Xeon's are almost similar in performance to i7's, but at a fraction of the cost) if you desire. If you go with Xeon, which are designed for servers, hence have no integrated GPU, you'll need to install a dedicated GPU (which you already have.)
If you're going to upgrade, I'd replace your motherboard, CPU and GPU (GPU if you desire.) In my opinion, you should keep the rest of your hardware, as long as you have a decent PSU. I would recommend AMD for keeping your CPU costs low, so you could spend more on a GPU, but unfortunately AMD haven't been able to compete with Intel as of late. So an Intel CPU and a GPU would be the best way to go. Unfortunately however, I find that components costs more in the United Kingdom, compared to the US so you can't always get the best bang for your buck/pound; I'm from the UK too.
You may keep your GPU's in crossfire if you like, or you can get a new single GPU if you desire. I mainly believe it's your CPU holding back performance. If you're willing to spend £600, and replace your existing GPU's, you could go with this (using your current components, except for motherboard, CPU and GPU):
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: Intel Core i7-4770 3.4GHz Quad-Core Processor (£211.19 @ Aria PC)
Motherboard: Gigabyte GA-H97-D3H ATX LGA1150 Motherboard (£79.57 @ Dabs)
Video Card: PowerColor Radeon R9 290 4GB PCS+ Video Card (£295.19 @ Aria PC)
Total: £585.95
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-03 22:37 BST+0100)
All the best.
