ASRock Z77 Pro4-M LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard for $60(when I buy this with the processor i was looking at) http://www.newegg.com/Product/Prod [...] 6813157306
I don't know enough about motherboards to know if the difference will be noticeable...I'm assuming I will only notice the $70 price difference.
The extreme 4 is a full sized ATX board with 7 expansion slots.
The M is a smaller micro-ATX board with 4 expansion slots.
Most of us only need a single pci-e expansion slot for a graphics card.
If you are interested in triple monitor gaming using sli, then the full atx board might be good.
Anything less, and the Matx will be fine. I happen to like Matx because you can put it in some really nice smaller cases.