Not really possible with the current choices, at least not in the $300 or even $3,000 range.
(hint: "global" is part of the problem, IMHO).
What is it you exactly want to do with your computer?
What kind of software do you need to run?
Are you going with a server and several slaves?
Is this to be connected to a global data base through the net?
I don't need specifics that would suggest the actual names of the programs or what you do, but if you answer the above questions we can probably give better suggestions for you.