I’ll just go ahead and pile on here. That you’re even asking tells me that you’ve never done this type of work before and you don’t have any idea what’s required to do it right. To even approach a bare minimum standard, you’re going to have to drop at least $20,000 on a Mac Pro, Kona Card, RAID and professional broadcast monitors.
And let me anticipate your next comment:
“Yeah, I know, that’s how it’s SUPPOSED to be done, but I’m looking for a cheaper entry-level system just to get me started.”
$20K *IS* the cheaper entry-level system.