Firewolfy, do the PSU mounts allow for the PSU to be mounted with the fan facing either up or down?
There are 3 mtg holes in the case. A while back I did a review of all popular sfx psu's (Corsair, Silverstone), and they all had 6 threaded holes, to enable mounting either fan up or down.
So you are good to mount the psu either way.
Some old Silverstones and some rare brands (server use I think) had less than 6 holes and they would need to mount with the fan down.