Gathering opinions on best proc for server/client combo

Hello all,

I would like to gather some opinions from this 
forum from anyone that would be so kind as to 
offer me some opinions on my setup. 

Interested mainly in server/client combinations 
of the below listed processors/gpus I have 
accumulated in the never ending quest for 
fsx/p3d happiness...all opinions are more than 
welcome - thanks in advance

cpus:

i73970k
i73930k
i74770k
i7975k (outdated i know, will run client/add-ons)

gpus:
gtx titan
gtx 680x2
gtx 590

drives:
2x 120gb corsair force gt ssds
2x 240gb corsair force gt ssds
3x 10,000 rpm 600gb velociraptors
2x 1tb seagate HDDs
(os/fsx drive combo opinions welcome as well)

All the above are custom liquid cooled(Koolance; cpu-mosfet-gpu) and have overclocked them all to 4.8ghz.
Have 3 monitors for windscreen views, two for instrument panelviews and one for moving maps and such - as well as an asus laptop that runs 
ActiveSkyNext weather and air hauler. 

I am looking for the most efficient combo, 
Bit of a long question I know but with the amount of work involved; assembly and installaton I sure would like to get it right...lol

Thanks again
DustBeats