If it helps;
If you already have the $129 version, the 'upgrade' is likely $149 to match what you quoted as the $269 price.
See here -
http://www.pgmusic.com/bbwin.packages.htm (scroll down)
Hope that helps.
To answer your last question; can you generate tracks in any other DAW like you can in Realband?
The value of that is up to you, but it is HUGE here.