Ok, since I usually put my foot where my mouth is, I went ahead and bought the casing and power supply. It should arrive during the week.
Antec Performance One P182
Antec TruePower Quatro 1000
While the P190 looked nice with it's built in 1200w PSU, it didn't look like it was optimised for "Quietness" the same way as the P182. Only dual layered soundproofing and a big gaping hole in the side where a lot of noise can escape.
Unfortunately, they didn't have the gfx card You suggested, so I am holding off for a moment on that one. I'll have to browse a few more shops to locate one it seems (I found a smaller/older model, HD3450 or something, but why settle for second best?).
Maybe I should look for a motherboard next...