I personally just spent 550€ on upgrading my pc.
I7 4790k, 16 gb ram and a z97 mobo.
I could have went with the I7 4960x but it's socket is old and the price/performance ratio is much better on the I7 4790k.
I could have also been waiting half a year, but when DDR4 and X99 first come out, they will be fairly overpriced. I don't see myself paying 1000€ for a cpu, 400€ for 16gb of ram and 300€ on a motherboard. The performance increase might be strong, but the current generation should be strong for 5-6 years, too.