Upgrade 9.3 with 10.0 RC1?

Hi folks-- Is it possible to use 10.0 RC1 to upgrade 9.3 Professional? In other words, will upgrading preserve all the non-free stuff like Java and True Type fonts, Real Player, etc? Or is it better to just do a fresh install of RC1? This relates to my earlier question this week about a dual-core X2 4800. The new CPU/Mobo is slated to arrive today, so I'll be reinstalling my OS; I've finally got all my data backed up. I'd hate to do a reinstall of everything from the ground up, only to have to do it again on October 6th when 10.0 ships. Maybe if I put RC1 on the new machine and not update anything until the 6th? Or just reinstall 9.3 and wait til the 6th? Thanks....