I'd leave it up to the girls. You can even find pictures online. That's exactly what I did with my kids. All 3, ages 10, 8, and 4, got to pick a character meal.
As far as food is concerned I bet 1900 Pk Fare would be the best choice. I haven't been to PSB (but have been to CRT's and understand the food is similar which is nothing to write home about)...but been to Pk Fare and I think their breakfast buffet is the best breakfast in WDW.
The characters at Pk Fare are Pooh, Eeyore, Mad Hatter & the hard to find Alice. Mary Poppins works the door. I didn't find the characters to be the main attraction here. I know the princesses are at PSB and that's a much more appealing attraction to the young girl's set unless they're not into the princesses.
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