I forgot to say anything about the case. I've not seen that case first hand but it does look good from your pictures. And you will need one that big to fit the GTX285 into it!

And locating PSUs at the bottom is definitely a good move in recent case design. It removes the excess heat they also generate from the rest of the components. I especially like cases with the 2 chamber design like the P180.

One question though about PSUs at the bottom. Did you have to mount the PSU upsidedown so the PSU fan is pointing upwards? If so the only concern I would then have is something falling down into the fan blades.