hey, did you ever figure out your winning concerto piece?
music-only colleges, ( or conservatories?) can be found at this website
http://musicalchairs.info/Conservatoires%20English.htm
it also lists universities with distinctive music colleges (such as yale), which would be a good decision if you wanted a well-rounded education in addition to a music degree.
also, a good decision to be discussed with your private teacher, who doesn't sound like he has been very helpful thus far...
good luck!