I'd probably stick with Novell Suse if only Novell and Fedora are you choices, since Fedora is more of a developemental branch of Redhat. If you want Redhat I'd probably just bite the bullet and subscribe to their technical support to get the OS. (they just, or are just about to release the next Redhat enterprise OS, btw)
My personal distro of choice is Debian Testing, though. (it's like the swiss army knife of operating systems) Anybody using a modern kernel (latest 2.4 series or 2.6 series) will be able to easily saturate the fastest WAN connections with a 200mhz cpu, or a gigabyte ethernet backbone with a 1ghz or faster CPU (due to the small packet ethernet size generates a LOT of cpu interrupts. Packets are very small and they pump out at a tremendous rate to get 1Gbps.). What would matter more is what is going on in the background, like does it have to access a database alot, or pull a lot of data to and from the harddrive(s)? Lots of RAM can help reach maximum performance in those cases, I figure.
Also dont' forget to take a look at free software solutions like Jabber and whatnot, not that I am knocking Akeni or anything like that. I just like free software. Also there is H323 teleconferncing solutions aviable for Linux that work well with Microsoft's Netmeeting stuff, like OpenH323 and Gnomemeeting. Lots of associated software like gatekeepers (translates phone numbers and names into ip addresses and takes care of compatabilities with VoIP phones and such), or gateways to hook POTS up to VoIP-based network and such things of that nature. And digitally handling fax transmittions with hylafax and such. Lots of room for growth is what I am saying.
Good luck.
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