After 2 years playing decided to go for a few upgrades. Dell 25" 1440p monitor, could have gone bigger, but sit quite close to the screen anyway. Replacing a Dell 1920x1200 monitor. Corsair wireless 7.1 Dolby headphones, replacing on-board 5.1 audio with Triton 5.1 positional headphones. Logitech G700s wirelessmouse replacing the G500. Both are a similar size, but being wireless allows me to be just a tad more accurate I feel.
Finally a Gigabyte GTX980Ti replacing SLI GTX 670's. The Monitor is fine for gaming, The GTX 980 Ti keeps frame rate at 60 all the time, where @1440, the SLI 670's would drop into the 40's occasionally. I use v-sync because I don't like tearing and can't really justify a g-sync monitor. The only real gripe I have is the audio. I've been reading everywhere that positional headphones are rubbish. Whilst the quality of the audio from the Corsair is much better than the on-board audio, the positional accuracy is no where as good as the Tritons were. Also there is tremendous reverb. I suppose I'll get used to it eventually.