Wow, this thread escalated to 9 pages in 2 days, impressive! A couple of personal observations from the OP and some of the posts here (I have not read thru all 9 pages, so I do apologize if I'm repeating someone else here)....
1 - OP has a dual GPU setup with 3 monitors. OP also mentioned no issues with cost. This, to me, says he/she is what I would call close to an "enthusiast".
2- OP lives near a Micro Center. There are options here. An i7 4790k and an ASRock extreme 4 will cost $385 + tax. OP can use existing RAM / HSF and call it a day. Or, OP can go balls out and get an entry level x99 based setup: 5820k + ASRock Extreme 4 for $499. This would obviously also include the higher entry cost of DDR4 RAM, but you can start with 8gb in dual channel. Also consider the cost of the cpu HSF.
3- OP can sell the AMD setup and keep the RAM if going with a z97 setup.
4- OP mentioned some games that are cpu heavy when running multiplayer. A 6 core, x99 setup costs more, but may be the better long-term investment overall.
Food for thought