I got a PM requesting suggestions on the mobo...
My first answer is: wait for Ryzen! (2 March). Spending 2.5K right now in an Intel quad core rig would be really, really silly.
If you're really determined to build right now, which I don't recommend, you need to ask what features you want in a motherboard.
Boards like the MSI Z270-A Pro, Gigabyte GA-Z270-HD3 and ASRock Z270 Pro4 offer everything most gamers will ever need. They have decent overclocking (though if you're chasing the highest possible OC's they won't be the best), at least one M.2 slot for NVMe storage, plenty of SATA and USB 3, LAN, etc.
They start at the $110-120 mark. That's where I'd be shopping myself, probably.
So then you need to ask yourself what features are actually worth more money to you?
- Multi GPU support? (MSI have a cheap SLI board for $114 at the moment, but SLI support can generally be found in boards from $140+). I might consider this were I in your shoes. Having SLI as a possibility for the future could well be worth $20-30.
- USB 3.1 Gen2? Higher end audio? LAN? Better power delivery, additional overclocking features (the sky's the limit here, with some boards providing all sorts of features useful for competitive OCers running exotic cooling solutions, but basically useless for 99% of even hardcore gamers and enthusiasts)
Remember with motherboards it's about features, not performance. So look at side-by-side comparsions between boards you're interested in, figure out how much extra those features are costing you, and then decide whether those features are actually worth the extra cost **to you**. I use a USB headset, so I couldn't care less about the onboard audio - I never use it. But an audiophile who listens to high quality music all the time on a premium set of analogue headphones would very likely pay a bit extra for a better shielded and higher end audio solution. Maybe they just get an external DAC... whatever. The point is, different features are worth different amounts to different people. You decide what you care about and how much it's worth to you.