Quote:
32-bit Ubuntu. That's what you should try.
The 64-bit version will have trouble with third-party binary apps
and some browser plugins, all of which are generally okay only on 32-bit.

Based on what? x86-64 Linux runs x86-32 just fine, and the vast majority of applications are 32-bit applications. I'm sure that you can get a 64-bit Firefox, which would have trouble with binary extensions, but why would you?

I can tell you that I'm running proprietary, closed-source, binary-distribution, 32-bit apps on 64-bit Linux all the time with no problems.

Of course, that begs the question of why you would bother with the 64-bit Linux at all, which is a valid question. The only thing it gains you is the transparent ability to have individual applications use more than 4GB of memory (including swap space) at once, which is probably not going to be a concern for you. But you did ask about video editing, which is probably one of the consumer applications where this would be relevant.
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Bitt Faulk