If you are going to get a micro-atx check the power requirements of the I7-3770 versus the I7-3770s relative to the power supply you will have and the number of fans. I ended up going with the 3770s, and sacrificed little bit of performance (slower clock speed), because of power and heat issues in the small case. I read a post where someone said that the regular 3770 worked in the DQ77KB mobo, even though it's not listed as supported. Definately don't go with the I7-3770K as you lose the vt-d stuff as part of the trade off for it being able to be overclocked.
Regarding the second lan port, it's primary purpose is for the Intel AMT support. I've tested that and it works. However, VMWare ESXi doesn't have drivers for it so it's not recognized, but i guess you could pass it through to a VM if you wanted. Supposedly the second lan port can pull double duty and be used for both the AMT stuff and by the o/s at the same time, although I have read posts where people have reported things like dropped packets if it's doing double duty. I'm just using it for AMT.