It can fit a dual slot graphics card, a full sized optical drive and a pair of 3.5" hard drives:
http://www.techpowerup.com/reviews/LianLi/PC-Q11/1.html
Scan are currently selling the PC-Q11 for around £85:
http://www.scan.co.uk/Product.aspx?W...source=froogle
There is a comparison between the size of the PC-Q11 and PC-Q07 in this thread:
http://hardforum.com/showthread.php?t=1523097&page=5
It also seems it is possible to fit an HX650W within the case too.