Hey there guys!

I've recently opened a discussion in which I got to a conclusion that I should make a more future proof upgrade to my PC, that gets more value out of my pocket.

I've came to the SURE upgrade path of

FSP Raider 650W
Corsair 8GB Vengeance Low Profile DDR3 1600MHz CL9 KIT

The questionable part comes now:
i5 3570k
ASRock Z77 Pro3/4

The other one:
i5 4670k
ASRock Z87 Pro3

I am not dedicated to ASRock as a brand, I just chose those because I think they are the best bang for the buck currently with those chipsets. If you can recommend an Asus or such that you think is worth the value and is around the same price, go on

Fact: I am not upgrading my PC all so often, so that is one thing to keep in mind. I'm not sure how long lifespan sockets do have, but knowing the 1150 is newer, it might have a longer future. At some point, both might be dead by the team I come to upgrade my PC again. So after all the 4670k has better pure performance without OC, the 3570k overclocks better though. I'm not a hardcore OC-er though, so that might be the edge of decision.

I hope you can help me to get on my path for a better PC

The performance difference is relatively small (5-10%) and both platforms will probably be dead when you want to upgrade your pc the next time: Intel Tick-Tock
So if you can get an Ivybridge bundle at a significantly lower price just go for it, but looking at the german prices the difference is like 15€ for CPU and Mainboard, so I would sooner go for Haswell.

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So after all the 4670k has better pure performance without OC, the 3570k overclocks better though. I'm not a hardcore OC-er though, so that might be the edge of decision.

The average Ivybridge CPU might be slightly better for overclocking, but there is a huge spreading in overclocking quality. It's possible that you get a Haswell that reaches higher clocks with less voltage.
But overclocking with the stock cooler is very limited anyway, so either you get a decent cooler or save your money and get a "non k".

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I am not dedicated to ASRock as a brand, I just chose those because I think they are the best bang for the buck currently with those chipsets. If you can recommend an Asus or such that you think is worth the value and is around the same price, go on

ASRock has become a decent brand over the last couple of years. I have build a couple of systems with ASRock Z77 and Z87 boards and they all work well and offer a good performance at a low price.

Thanks for the advice dude. I finally shot my vote next to the 4th generation Intel along with an Asus Z87-k. I hope that will last some time for me.