Before I buy this mechanical keyboard, I was just wondering if there is anything that would be more worthwhile at around ~£80 or so. Here are my specs at the moment. 3570K Z77-D3H AMD 6870 Gelid Tranquillo Corsair Neutron 240GB Phantom 410 Corsair HX650 4GB DDR3 1600 Asus Xonar DG Sennheiser 598 Zalman Z-1 mic Logitech G400 Sidewinder X4 I mainly use the PC for gaming, and play at a resolution of 1360x768 (A waste, but I can't change my monitor right now...) This is a strange question I know, just finding it hard to justify £80 on just a keyboard.
Stick another 4gb stick of ram in there and possibly add another case fan (if required). Otherwise keyboard is your best bet. Alternatively you could sell current hardware and do a bigger upgrade e.g. 6870 to 7950 but that isn't that cost effective.
get a monitor like a cheap ips monitor with 1080 hd resolutions let the colour come to you i got a asus pa238 top monitor, well worth that way
You say you can't get a new monitor, I'm presuming that's not purely due to money. As a result, a keyboard would be a great purchase, you won't regret it (doesn't have to cost you that much either) Only other suggestion would be another 4gb of RAM.
If you haven't used one, and like your X4, I'd stick with the X4. I know everyone who has one bangs on about how good they are, but like someone said on a different thread, if you don't know any better you're not going to miss it. Ignorance is bliss - or in this case cheaper lol. Main reason why I've not gone near one.