As much as I hate to say it....you may want to look at building a new computer.
The most important things you could do to speed things up are a new CPU and a dedicated GPU for hardware acceleration, however in both of those cases you are probably going to run into power issues either from the voltage regulators on the motherboard if you upgrade the CPU, or from your power supply if you install a beefy OpenCL GPU.
Although in theory that motherboard should support an 8-core CPU, the voltage regulator module (hereinafter "VRM") is a 4+1 phase with no cooling whatsoever, active or passive - completely inadequate to keep juice going to the CPU during long renders or even long preview sessions.
The built in GPU on that board is even less suited to intensive tasks, if it even actually fully support OpenCL.
As I said, while upgrading one or both of those parts will provide you with an order of magnitude more performance, either or both would require additional parts in support. You would be monetarily better off just biting the bullet and replacing the core of the system all at once.
As for good news, if you stick with an AMD system or an Intel 1150 platform, you won't need to replace the RAM, and your SSDs, case, and other peripherals should be fine to use with a new motherboard/PSU/CPU/GPU.
If you want a recommendation for a setup, I'd actually recommend something close to mine in terms of the best price/performance ratio -
Any Asrock or ASUS motherboard with 8 phase power delivery -
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157281 is a good choice.
AMD 8-core CPU - I don't recommend the 8350/8370 or the 9000 CPUs, the 8320 is the sweet spot, and if you feel adventurous it overclocks to the same speeds as the 8350/8370 with no difficulties whatsoever. Invest in a quality CPU cooler - an All-in-one watercooler is a great way to go. Rendering and editing can put heavy loads for long periods, and heat is the ultimate enemy of your CPU - it may also cause the CPU to throttle down under load, so a good cooler guarantees that you will be running at full speed at all times.
For a GPU, get something from AMD - right now the prices are rediculously low on their top cards, and they have far, far, far superior OpenCL performance than nVidia cards. The R9 290 (non-X) is the sweet spot, but the 270X and 280X are reasonable choices as well. Try to find one with a non-reference design cooler - non-reference cards run cooler and quieter.
As for the power supply, anything above 650W from a reputable manufacturer - Silverstone, EVGA, Corsair, and a few others (jonnyguru.com is the premier power supply review site, check there if you need to).
As for the rest, salvage everything else. If you live near a Microcenter, buy your motherboard/CPU there - you will probably save 40% off of what newegg charges.
Any other questions, feel free to ask.
Nanoxia Deep Silence 1 case | Ultra X4 850W PSU | Asrock Fatal1ty Killer 990FX | AMD FX8320@4.7gHz | Coolermaster Nepton 240m | 2x HIS R9 290 GPUs | 24gb G.Skill Ripjaws 1600mHz DDR3 | OCZ ARC 100 480gb SSD | Various WD Black and Seagate drives to the tune of ~20tb | I have been building systems for over 16 years, however my opinions can be and sometimes are incorrect. Please, call me out if I say something asinine.