Oh nice! You finally got this one going.
Well, as you know, you got the stuff you really
needed already. Your cpu is fine. At this point, you might as well stick or you will just be throwing money away. We've talking a lot about this and a new videocard would definitely be the next best thing to get working on. You'll see the largest improvement in all your games, including Planetside 2.
I like your current choice but I wouldn't lock in that specific card just yet. Though the price is definitely nice, keep your eyes open and you might find something even more suitable.
I still think you should improve your monitor situation and I know we could and have gone on for hours about it. There are many ways of doing it but I think, imho, the best bet might just to replace that 16:10 I gave you and get one of those Korean 27" 1440p monitors and use that as your main monitor for gaming and such. That way all you gotta do is swap out and enjoy the improvement and extra size which I know you'll appreciate immediately. Now about your triple monitors....considering the room you have on your desk, I'd still go with dual monitors, one on each side in portrait mode. It would work both for games cuz you'd now have a proper 16:9 right in the middle so fps games and ...well, everything would still display correctly but then you could get an extended view of you wanted and it wouldn't be some crazy excess of 180 degrees like three 16:9's side by side. Plus that would be like 5ft wide and we know that wouldnt fit in your corner.
But anyway, the portraits would work perfect for when you have websites and stuff up like Netflix, livestreams, dvd/BD's and that's usually how you play games anyway.
I know you've heard all this from me a bunch of times but it's only cuz I know what you like.
You can go many other ways, obviously. Hopefully you can get some traffic in here to spur up your imagination some more even.