Which case to get?

This is the only thing holding me back right now.  I am trying to find a case for my new computer.  I am building a quad core with the low end 8800gts.  This means I need cooling.  But I also want it quiet.  Here's the three cases I am thinking about and why it's on the list.  I am also getting an asus motherboard that is fanless (meaning it doesn't use fans to cool the bridges).  I am also getting a modular psu so I only have the cables I need.

First, the cool thing about all of these cases is they are tooless, at least when it comes to putting the hdd in.  Also they all have a tool box with plenty of room (such as to store the extra psu cables).

I am going to list them in order of my current preferences.

Thermaltake Armor with 250mm fan
It has a huge fan.  It pushes alot of air and is very quiet (16db).  The 120mm fans are pretty quiet too.  The 90mm fans I might replace with silenx fans to get more quiet.
The advantage this case has is the huge fan and plenty of room.  However, I am getting a tall heat sink (thermalright ultra 120) so I hope there is room for it.  The case does look wide.  There would be minimal cables around the motherboard as I would put the hdd in the cage next to the psu.  This case is also completely tooless, unlike the others.  You don't need screws for the expansion slots.  The only thing that worries me is the heat sink is meant for wind tunnel effect.  I think the huge side fan might disturb that.  The reason I am using that heat sink is it significantly out performs everything else for the Q6600.  This case also has more fans then the others, but they are big fans so they should be quiet.

Antec P182
This seems to be the case everyone is using right now.  I like it because it looks simple.  The power supply on the bottom is interesting.  With two 120mm fans in back and top there would be plenty of airflow.  The one thing I have heard is 8800 cards are a tad too long.  Though all you have to do is remove the middle hdd cage.

Gigabyte 3D Aurora 570
The advantage this has is all the space.  It's a huge tower.  It does have two rear 120mm fans.  This is also the most expensive of the three.  The led logo projection feature is funny.  Part of the reason this is so big is it is designed to house the Gigabyte water cooling kit.  That's also why it has the two 120mm fans on back, you are suppose to be able to bolt the radiator on the back.

Also, with no overclocking, how big of a PSU would I need to power a quad core system with a low end 8800gts?  I have a 550W selected.