i have the armor case, it is the best case i have had so far, my last one was tt as well.
as far as hdd go , i would say you should consider raid. i have 3 raid stripes in my pc
i have watercooling on my cpu and gpu using bigwater, no problems (that werent of my own doing.....*cough*)
i have c2d it does me fine, way faster than my 2.8ghz P4 ht