QUALITY should be your prime concern and statistically MSI isn't the best. More specifically, don't buy ANY motherboard unless you can find a site that has at least ten Customer Feedback scores/comments that give you a rough idea of whether it has issues.
Maybe the MSI board recommended is just too new, but I didn't find many customer reviews. Here's one you should read though (CLICK the link under the title): http://www.newegg.com/Product/Product.aspx?Item=N82E16813130760&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
With that in mind, I suggest something more like THIS:
http://pcpartpicker.com/part/gigabyte-motherboard-gah87d3h
Other:
I read an article that said there's really NO difference between modern network chips and ones like the "Killer NIC" in any way including LAG. The major cause of lag was based on server load and distance to server but not the persons computer.
It USED to be an issue, much like a dedicated sound card could reduce CPU overhead but the article did extensive testing (can't find link) and said that there's really no benefit any more. In some cases there are even PROBLEMS with the way the software handles things.