You really don't know that until you've gotten through the first stages of the applications process, so don't let anyone discourage you. Keep an open mind about the quality of each program. Even though you may have never heard of St. Someone's Hospital, it might have an excellent program. There are too many residency programs in each specialty for anyone to keep a running tab on which is the best program. Furthermore, the goals of each residency program within a specialty are varied enough that different programs excel for different reasons.
Financial considerations can be a factor.
While there are ways to limit costs, the amount of travel required to interview at a large number of programs can be very expensive. Some airlines offer continuous fare tickets, which are a significant advantage over purchasing individual fares. However, this does mean having to do most of your interviewing in one long trip. Once you have settled on an initial pool of programs and have received written information about each one, you must now decide where you will apply. To help you decide, consider looking for other sources of information to balance the information provided by the programs.