Help deciding Video editing setup

Basicly I've never owned a mac myself but have been working on them in the studio for the past two years. I know have money to create my own editing suite and am at a loss of how to configure a new mac to run fast and smooth. Any and all help is great.

My Budget: 3,000 to 5,000 possibly Including monitors

I've been looking at the Mac pros quad or 8 core. Will this alone be enough to edit 1080p hd photoage in h.264 or trans coded to apple pro ress with final cut studio?

All open to setting up a raid 0 stiped system to increase perfomance but don't fully understand which drives are better.

Basicly I just want a computer with fast load and redner times and can play back clips from my 5d mk11 in real time.

I realy know very little about computer internals so I have no clue if a single quad core or 8 core is enough or do i need to install additional drives and add stuff??

Thanks Again

Mackenzie