What is affordable to one, is likely not going to be affordable to another:
Best $$275-ish Board = MSI Gaming Z170A XPower Titanium - Great OC Tools, outstanding component quality / features, MIL spec componentry, great OC tools, gorgeous looks, outstanding user satisfaction (86% 5 eggs / 4 % 1 egg) from newegg board owners
$283 -
https://pcpartpicker.com/part/msi-motherboard-z170axpowergamingtitaniumedition
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130870
Best $200-ish Board = GIGABYTE G1 Gaming GA-Z170X-Gaming 7 - Great looks, performance and overclocking, solid / stable componentry, good overclocking, 60% 5 eggs / 13% 1 egg user reviews
$199
https://pcpartpicker.com/part/gigabyte-motherboard-gaz170xgaming7
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128835
Best $150-ish board = MSI MSI Gaming Z170A-G45 Gaming - Earlier version was a big award winner, MIL Spec 5 solid componentry,, good overclocking and too little reviews to be statistically significant, (tho 67% 5 eggs / 0% 1 egg is encouraging so far)
$163 -
https://pcpartpicker.com/part/msi-motherboard-z170ag45gaming
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130875
Best $125ish board = GIGABYTE G1 Gaming GA-Z170X-Gaming 3 - Still has ALC 1150 sound solution and SLI, few boards at this price range do ... solid board all around, good overclocking, 57% 5 eggs / 18% 1 egg
$125 -
https://pcpartpicker.com/part/gigabyte-motherboard-gaz170xgaming3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128837