Apple is making so much money off iPhone, iPad, and their Apps store that they forgot the rule about new friends are gold but keep the silver.
I think Adobe Premiere Pro CS5 and a good nVidia graphics card is where it's at. I built a Phenom X4 quad with only 4 GB of RAM and it can edit HD video flawlessly with Premiere and a good nVidia Fermi Card. It's not even an Intel i7 (which has a bigger transport bus...). I don't think Mac is where it's at anymore with Professional Level video editing.
Amateur Porn producers will find that the new Final Cut Pro X will meet most of their needs though. I don't think Apple ever developed this new version for a feature film or studio duty editing. It's meant for ProConsumers... home power-users.
It costs less then Adobe Premiere though... but if your doing a lot of editing such for a tube site or need the video in this codec and that codec then Adobe Media Encoder is where it's at right now. You can give it a list of tasks to complete (encode this to that and that to this...) and it'll FTP them to a remote server once it's one transcoding or rendering. This cost savings however is off set by the cost of Apple hardware. iMacs are hard to upgrade. With PC's you can upgrade and keep certain parts instead of buy a whole new system.
HD video editing works best with several SATA 6 Gbps hard disks. (One for sound, one for video, one for scratch, etc...) That's so you're not trying to read and write a bunch of data to the same hard disk or SATA port. Things run smoother if your working from several different drives and SATA ports. With an iMac there is one main drive. You can plug in an external SATA hard drive but that costs more money.
I think for business, a good PC, nvidia graphics card (for GPU assisted rendering)... and Premiere CS5 makes more business sense.
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