Hi,
I am curious though. Why exactly should I chose SME7pre1 over SME6.0.1? Is 7 stable enough to use in a corporate environment. This server will be operating a multi-site nationwide network.
I upgraded from 6.01 to 7 for better hardware-support (SATA, GB-Lan, RAID), for Samba 3 over 2.0.12 (works better with our WinXP Boxes) and better integration of spamfilter, clamav and such. Exactly i never missed 6.01 since. No need for complicated addons and contribs so far. And SME7 is rock-stable. No downtimes for any reason but reconfigure/reboot after yum updates.
But don't ask me about nationwide networks.

I am part-time admin in a soho environment.
But i perhaps would not choose SME as PDC for such a big network. A common linux distro perhaps is easier to tweak and tune.