No judgement, but I'm wondering why you're aiming for a Top 20 institution if you aren't passionate about research. The main advantage of these schools is that they give you the resources to launch a career in research and academic medicine. Most often they have considerable built-in time dedicated to research, which is frequently a mandatory part of the curriculum. There are plenty of excellent non-top 20 schools that will prepare you for a very successful, service-oriented career in medicine. There are also some Top 20 schools that have an excellent focus on service (UCSF, for example), but in general the top 20s are more research-oriented than service-oriented.