Wowee! Seems like not only would I have to buy the current #990 at about $350, but also the Legacy Powermaster (currently I have the TMCC Powermaster) at about $100 and also a 180W Powerhouse at about $100 (I have the 131W Powerhouse).
So to get the ability to scroll through station announcements and to open and close the doors with one touch, I am looking at spending $550.
(Sigh).