1. The overclockable mobos for intel processors are a bit pricey... These are some good one but they cost above 9.5k : Gigabyte G1 Sniper 3, ASUS P8Z77-VLX, Gigabyte GA-Z77MX-D3H...
2. Yes you can crossfire it... But if you are planning the same then better buy nvidia based card because of...