Hey John K., if you mean the DV codec by DV the minimum requirements for the edit system are much lower than you think they are…years ago i was able to edit MiniDV on a P4 1.5 GHz with Adobe’s Premiere…
to John W.:
Vegas is very ressource friendly it just depends on the resolutions you’re working on, HD requires somewhat four times more processing time than standard tv resolutions…an older Pentium M with 2 GHz should help you working on HD as well, but if you can go with a core2duo, do it.