Kybar,
Good choice on the Mac and FCP. Some suggestions from a long time Mac user:
Before you buy, look at Apple's web site for refurbished computers.
Get a Mac Pro.
Buy the basic machine from them, buy extra memory and hard drives from someone else. I've used Other World Computing for years with zero complaints.
Use internal sata drives. Forget about external drives, especially USB drives, no good for video transfer.

Once you go Mac you'll never go back.

Ken