It looks solid, but I'd definitely change some things.
Firstly, the graphics card is nice if you have size limitations. In this case, you don't - it'll fit a standard GTX780Ti/Titan without issue. Given the price of that card, I'd definitely say you are better off with a GTX770 as you are more than halfway there (in terms of price) anyway.
Also, the nature of the case leans itself towards reference design cards, though Titan cooler GTX770s are hard to find which means you are probably looking at something like this -
http://uk.pcpartpicker.com/part/pny-video-card-gf770gtx2gepb
I don't think I would pick that motherboard unless I desperately needed AC Wifi (and even if I did, I'd probably pick the ASRock, despite it's layout not being terribly favourable to this case. The Asus Z87I-Pro is simiarly priced, very well featured, and has a CPU socket location which gives you a bit more flexibility on coolers (though it again isn't terribly suited to a case of this orientation). All three are nice boards though.
I'd probably change the SSD. They are good value (among the cheapest 120Gb SSDs you can get) but I'd be more inclined towards the 840 EVO.
You shouldn't need fan filters. The two fans on the roof of the Hadron air are exhausts.
Buying a CPU+motherboard on the logic "you might" overclock isn't necessarily the best value, especially when you consider that in a gaming setting they usually offer pretty small returns. Also, while you can overclock in a Hadron Air, the cooler support and airflow is fairly low, so you aren't going to be pushing huge numbers. It's worth considering that you could chop quite a bit off the cost here. It is vaguely feasible to do a GTX780 build in a Hadron Air for under £900, and that build would wipe the floor with anything GTX760/770 based.
If you do want to go for an overclockable CPU, then you'll need a cooler (and it wouldn't be the worst idea even if you don't). You are height limited here, but any 90-93mm fan based tower cooler is a good bet. You can use low profile coolers with bigger fans, but I'm not sure it's worth the hassle of compatibility. Examples - Coolermaster Hyper TX3, Hyper 101, Xigmatek Loki, Arctic Freezer 13, EVGA ACX ITX cooler, Scythe Katana 4 might squeeze in too, motherboard dependant. Lots of options, though do double check the heights.