Haswell is only 10% overall improvement over IB, is the latest platform, and yes currently the best for gaming
. If you don't currently have a motherboard, then yes it needs socket 1150/Z87. Mentioned that in the other thread. You don't need to worry about their crap IGP.
Overclocking on Haswell will be about the same actually. I suspect about 4.5-5GHz and that's really what a 3570k or 3770k caps at due to their TIM contact with the cores rather than solder. You already said you don't want to OC much so not really an issue, especially on their GPU. If you have a dedicated GPU then the IGP will just be disabled. So don't even worry about that stuff.
Certain 770s come with a backplate. The brand I recommend for GPUs (eVGA) typically give a backplate for their higher end models. Their 4GB 770 is the one I recommend due to future game demands, although it's currently out of stock.
Newegg.com - EVGA 04G-P4-3778-KR GeForce GTX 770 4GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card
"Resolution is just a number." #Ubisoft Origin/Steam
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