Hey thats great news! Sounds like you finally found someone who is
1) knowledgeable
2) helpful

What a stunning combination!!

With a 49-50cm frame and a 51.5+ inch top tube (aka my bike!) you totally should be able to get 700cc wheels. If you're interested in bargain shopping there are many more options of wheelsets to choose from.

BTW, is a 60-70mm stem short enough to give you handling issues? Just wondering...someone more knowledgeable might be able to address that...