From what ive been reading i think this might be good.
Acousticase 6607http://www.acoustiproducts.com/en/popup ... lkopen.asp
Yes, it's a good case but
for $199 USD it's wildly overpriced for what it is. This is the EXACT same case as a Compucase LX-6A19 with silencing extras (ie. Acoustipack, rubber fan isolators, rubber feet, etc). Considering that the LX-6A19 can be found for ~$40 online (directron.com), that's a huge cost differential for soundproofing foam, rubber feet, etc. which you can install yourself.
But if you don't want to do any work yourself, then yeah, it's a good case.
With either case, you will definately want to punch/cut out both fan grills at the minimum.
The graphics card
A nvidia 6600GT (I dont know loudness of this, but maybe i should get ZM80C/D-HP)
Not a good combo. You should check out this thread
. You could use an Arctic Cooling NV Silencer instead which dumps the heat outside the case.
This one i cannot decide. Should i go fanless or not. Maybe i go with the antec phantom 350w .... Or should i get a Seasonic Super Tornado 400w
The phantom (while silent) will dump loads of heat into the interior of your case which you'll need to compensate for with the rear fan. I don't think the nexus fan would move enough air as your only exhaust in that situation. Of your choices, I'd recommend the Seasonic as well as a pair of nexus fans (front/rear). You'd definately need both 120mm fans(PSU/rear fan) as heat extraction for the amount of heat being produced in your case. With 4 Maxtor HDDs pumping all that heat! You'd NEED a front fan to keep them cool.
I'd rethink this and depending on your storage needs, switch to a single/large HDD instead of many small ones.
You could check out my build pictures here
of a LX-6A19 with a Fortron FSP300-60PN (very similar to the Seasonic) for a combined case/PSU price of ~$80 USD. Check it out.