Never seen an 8 monitor card.. the highest ive seen was an ATI 5870 with 6 mini displayports. It looks like its been discontinued. For 8 monitors youd probably want to get a crossfire/sli solution anyway, especially at that resolution.
For watercooling the cpu, you could get a closed loop like the corsair h50 or whatever. For a cpu/gpu or cpu/gpu/gpu loop its going to cost you, and youll probably want a large case specially meant for watercooling.
They also sell some PC sound insulation material thats worth a look into. its pretty cheap.