Welcome LinuxGlobe!
As much as it may pain me to say it, if you want a Mac OS X look-alike, you may consider looking into DreamLinux. At least one member on the board here will be happy to tell you all he knows about it and from what I've seen it's essentially the same guts as Ubuntu (Debian actually, and possibly minus a few of the nicest conveniences of Ubuntu) but it looks like OS X and they try very hard to emulate that look.
All the software that runs on any Linux distro should be able to run on DreamLinux, do check out the VideoLinux distro. The distro itself is listed as dormant on distrowatch.org, but that link provides a glance at the software they include which you could install into DreamLinux to get your OS X-like video editing Linux powerhouse.
If you have any questions be sure to hit this board up - we have a broad range and depth of experience across the members as well as a few "researchers" who can help you find your answers. Plus we're usually quite friendly! 
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Ubuntu 8.10 (64-bit), Ubuntu 7.10 (64-bit)
OpenFiler 2.2 (rPath Linux base), Mythbuntu 8.10