Hi, Vascubaguy! I think most of your PS choices are fine:
Coral Reef- IMHO, not worth Signature status. Expensive, yes, but not that great and portions are small.
Akershus- Good, and if you want Princesses, it's fun! (You do know it's an All-Princess Character meal now, right? All three meals a day!!)
Brown Derby- Fantastic- well worth two TS credits.
50's Prime Time- Good food- just not my cup of tea (too shy to play along with the servers).
Boma- haven't eaten here, but it gets RAVE reviews. Great choice!
CRT- Again, good food, and the atmosphere can't be beat- b'fast and lunch (as of June 10) are character meals.
Recently, a lot of the Epcot WS restaurants have been added.

They include:
San Angel Inn- Mexico
Nine Dragons- China
Alfredo's- Italy
Teppenyaki- Japan
Marrakesh- Morocco
Chefs de France- France
And, Le Cellier in Canada has been changed from a Signature to a Table Svc restaurant.
That should give you some more places to think about! Happy planning!