best z97 chipset mobo for 140$ overlocking

For all round goodness and good power phases, I'd recommend this: http://www.outletpc.com/kc4537-ga-z97x-gaming-5-lga-1150-motherboard.html?utm_source=kc4537-ga-z97x-gaming-5-lga-1150-motherboard&utm_medium=shopping%2Bengine&utm_campaign=pcpartpicker&utm_content=Gigabyte%2B-%2BMotherboards%20%3E%20Intel%20LGA1150 which is right at your budget. The GA Z97X -Gaming 5 is an excellent motherboard.

This, http://www.superbiiz.com/detail.php?name=MB-Z97-A&c=CJ the ASUS Z97A will also produce good results at your budget. as will the similar Pro Gamer. http://www.newegg.com/Product/Product.aspx?Item=N82E16813132412&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

I have this board http://www.newegg.com/Product/Product.aspx?Item=N82E16813157504&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID= and have reached 4.8Ghz at 1.375V


I have also reached 4.8Ghx on both of my i7 4790Ks and my i5 4690K on my $100 ASRock Z97M OC Formula (which is currently out of stock, perhaps permanently)