I suggest you try using a league table to determine which schools have the best sociology programs and them researching the schools to see which you like.
According to The Complete Universty Guide ( I'm a fellow American, so I can't really say of it's a reputable source or not) the best schools for sociology are:
-Cambridge
-LSE
-Durham
-Warwick
- Bath
Depending on how good your SAT/ AP scores are, you might want to look at LSE, as it sounds like exactly what you're looking for.