Best speaker cable for Revel F-208's

"In the past what I have done is use two single runs on each speaker and they would be different manufacturerers one for the bottom end and one for the top."

If you need to do that, somethings wrong. If you match your components properly, cable selection is much easier.

"Im curious if pure copper, copper silver mix and what manufacturers would be a good fit."

Its impossible to say. You can have 2 pure copper cables that sound completely different.

One bit of advice I can offer is that it's not a good idea to mix 2 different cable types to a speaker unless you've checked their specs.
Speakers need low inductance cables which contribute to their resistance, and they need to be matched (or very close). One cable to the high/mid and a different cable to the bass may be of a different type of metal, or have a stranded or solid conductor and could make the sound not coherent from the different drivers.

As far as biwire or using single cable with jumpers, there are many, many threads in the archives.