I see this upgrade to 7 + DVD but no option for just V7. I really don't want to spend $250+ for an upgrade to the DVD version "whatever that is". Can you purchase just an upgrade to 7 without the DVD stuff?
Presumbly you're not using DVD Architect for producing your DVDs, but some other software (eg. Nero). However you may not be aware of the facilities provided by DVDA and, if not, it might be of interest to you. You have already noted that you can buy Vegas Pro with DVDA (these are separate software packages).
FYI, i'm ASSUMING that upgrade price is for Vegas to V7+DVDA AND V6+DVDA to V7+DVDA. If so, the just vegas users are getting a HUGE discount compared to previous years. That's the upgrade price users payed to upgrade to the same software/new version they had before (IE V4 to 5, 5 to 6).