Just a little while ago I got a gtx 770 2gb I am looking to do a 3 monitor setup but I don't know what I should do. I am thinking of getting a 2nd gtx 770 but I will have to get a new Mobo, Bigger case, and a new PSU. I was also thinking of getting one of the following: R9 290x, R9 290, GTX 780, or gtx 780 ti. Which should I get? (It's for gaming and money isn't an issue)