Just in case you haven't seen them here are a few other cases you might consider
Silverstone Sugo-F series
http://scan.co.uk/Product.aspx?WebProductId=798106
Available in black as well for a bit more money
Only two issues with them really is that they only have 80mm fans rather than a 120mm, which can be a fair bit quieter and the PSU sits over the CPU so cooler size is limited.
also the SG03 or SG04 are both small and have 120mm fans but are towers rather than cubes and still have the cpu cooler issue.
If you fancy something a bit more funky then the Aerocool M40 is possibly up your street it has a hinged top section, again only 80mm fans though.
http://www.thecoolingshop.com/produc...oducts_id=2752
Or the is the Lian Li PC-V350B
http://www.xcase.co.uk/p/520071/pc-v...delivery-.html
Or if your feeling really flush the NZXT Rouge
http://www.xcase.co.uk/p/452494/nzxt...blackblue.html
Oh and that DFI board looks sweet!