Very solid deal if you're in the market specifically for a white case w/ a vertically mounted GPU - The PCIE 3.0 Riser + Vertical Mounting Bracket bundle usually goes for £40!
Otherwise a nice case, had the pleasure of building in one, tons of airflow, ran quiet, nice build quality and good cable management (apart from the small distance between the top of the motherboard and the case wall). Looks stunning as well.
Gamers Nexus -
Tom's Hardware - tomshardware.com/reviews/phanteks-eclipse-p400a-case
In terms of alternative options, the Bitfenix Nova Mesh, Antec NX700, NX410, Aerocool Eclipse One come to mind, perhaps a Montec X3 Mesh or Aerocool Airhawk Duo if you don't mind noise, or a Lancool 215 Mesh or Phanteks G360A if you want some great looking white cases. All fairly well built cases with lots of airflow.
Details from Phanteks' website (can't paste promotional poster as image): phanteks.com/salestools/PH-EC400ATG.jpg