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It's not worth buying a new board and CPU if you can grab a used 2600k/2700k or 3770k and use that in place of the 2500.
I'll get a used 3770, worked out I can save a good 150 doing that!
What do you recommend for a modular psu? I've had mine a good long while, but it's a coolermaster and I'd rather get a good quality one especially if I'm investing into a 3770k and a 970. Also, that I'm awful at cable management so modular would be a blessing.