Help me with a os

I'm buying a 32gb ram 6core rig and i am just wondering is it worth buying ultimate if its 130 pound over professional witch is 70 pound.

Because the ultimate version has "OEM DSP OEI LCP SP1" witch i have no idea what it means and professional just says "SP1 & Coa Key" and says its OEM. I don't know the difference and am wondering witch one is best.

I don't want windows 8 because i don't know how to use it and home premium can only handle 16gb ram at max so it wont work for me.

Thanks for helping.

Well... what are you using it for?

server hosting gaming music creation rendering and compresion


This should give you an idea of the differences:

For your uses, I'd say professional is fine