E.L.
I have friends that use the Developmental Day School at First Presbyterian ...
http://www.firstpresdallas.org/index.cfm/PageID/842
the Child Development Program at the Callier Center at UT Southwestern ...
http://www.utdallas.edu/calliercenter/child-development/c...
and the childcare center at First United Methodist Church on Ross (didn't see web link to that one).
All three moms swear that their school/daycare is "the BEST" in the down town area ;-). You could probably not go wrong w/ any of those 3 - but I would definitely tour the schools, meet w/ the directors and see which feels the best to you. I remember doing that w/ my 1st and it was a LONG process. Good Luck!