when your talking about overclocking you are mainly talking about the power supply system of the motherboard. you want the most amount of power phases and parts used on the motherboard. much like a power supply, cheap capacitors and only a few power phases will limit the power the mobo can supply to the cpu and other parts. the cheaper the board, the cheaper the parts and the less likely it will hold a stable overclock of the system. for instance the z170-a, which is always a solid board from asus and well respected, sports these features for overclocking:
ASUS 5X Protection :
- ASUS DIGI+ VRM - 8 Phase digital power design
- ASUS Enhanced DRAM Overcurrent Protection - Short circuit damage prevention
- ASUS ESD Guards - Enhanced ESD protection
- ASUS High-Quality 5K-Hour Solid Capacitors - 2.5x long lifespan with excellent durability
- ASUS Stainless Steel Back I/O - 3x more durable corrosion-resistant coating
notice the 8 phases of power delivery. the really high end pro overclocking boards will have 12 or even more phases but these are the $250+ boards for very high end overclocking. as you look at specs and such this is something you need to look for is how many power phases it has. i's stick with 8 or more to ensure stable power delivery for your nice overclocked parts.
the asus "a" series (z87, z97, z170....) are always very solid choices and will handle a nice overclock well. the asrock fatality series is also a good choice around this budget. the z170 performance is about $150 and sports 10 phase power delivery and a lot of other perks aimed at "gaming" and overclocking.
PCPartPicker part list /
Price breakdown by merchant
Motherboard: ASRock Fatal1ty Z170 Gaming K4 ATX LGA1151 Motherboard ($143.99 @ SuperBiiz)
Total: $143.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-24 11:55 EDT-0400
as far as gaming goes, often the higher end boards will have more pcie lanes available through a plex chip which will allow for better use of multiple gpu's and the newer pcie ssd's without hobbling the gpu's to less than 16 lanes.