I like my "normal" tower because I can put my legs up on it. But yeah, big tower is nice, could use one too because I have 4 HDs; 2 are mounted in brackets in DVD bays: causes a lot of vibration.
Something I wanted to mention btw: have a look at Arctic Cooling fans. They have "PWM sharing" on their PWM fans. There's another 4-pin connector on the cable, so you can chain several fans together on the same connector. I've used this to mount 2 fans on my CPU cooler (Thermalright Ultima90; tower design).
Another feature they offer is temperature sensor build in, so the fan reacts on it's own, without the need of a controller. Also have a fan that comes with a knob (think that one is a Nexus) that let's you set the speed manually.
Just throwing it out there, no reason really.
http://www.arctic-cooling.com/catalo...php?cPath=3_48