Doc-Question- Are VST plug-ins real-time adjusting (like RTSA) or file based like Audio Suite? (I may be asking for a new thread here....)
Either way, software plug-ins use the CPU and will dig into processing speeds. Hence the need for lots and lots of RAM and fast hard drives.
Email Cakewalk and Digidesign to verify compatibility and their recommendations for any extra gear. They will both want you on Windows XP for sure.
I once thought a "Sweeping Arpeggio" was an Italian janitor.