Corsair 4000d might fit your bill. Quite newly released great airflow case with window.
Phanteks P400A. around £70 and it's ana excellent case with great airflow
Bought a Lian-Li Lancool 205M for a PC build and for the price I'm utterly blown away. Looks great, well built, easy to build with nice cable management. For £45 I can't fault it!
That is nice, would be first time building that way for me too with the fans/rad at the back and the GPU vertical.What about the new Lian Li 011 Dynamic Mini, its pre order at them moment and £90, loads of airflow and houses every size motherboard going.