I'm a life long PC user and transitioning to the Mac since it's industry standard. I'd like to get a Mac Pro to use for HD editing and I have $5,000 to purchase a system. I must purchase within the next week; can't really wait or I may lose that $5,000. That said, what are some things I should specifically keep in mind? Things like... amount of RAM, storage, go with two 8 cores of 4 cores, should I buy RAM/HDD elsewhere to save money, etc. Please help this ignorant PC numbskull understand the power of Apple.