I would focus on what particular area of ID interests you and what kind of career you anticipate.
For example here are some broad categories within ID, they are definitely not mutually exclusive and may not be comprehensive :
-Basic science research
-Clinical research
-Clinical trials
-Vaccine research
-Public Health
-Clinical Microbiology
-International Medicine
-Travel Medicine
-Private practice/Community hospital consultations
-ID/Critical Care (this exists but is rare)
-Hospital epidemiology
-Infection Control
-Antimicrobial stewardship
-HIV
-Hepatitis C
-Transplant ID
ID programs have different strengths. For example clinical programs provide you with two years of intense clinical training and leave you ready to go out and practice immediately. Research programs typically cram all of your clinical experience into one year with minimal clinical requirements after that year. The best research programs either have guaranteed NIH funding for all three years (T32), lots of money on hand for your area of interest, or ideally both. Finally not every program is ideal for international work, in my mind the best programs for this either have an established relationship with your region of interest and/or the ability to provide training in these areas that count towards your fellowship training (meaning after your first year of clinical training you can spend the rest of your time in your region of interest).
As far as improving your application I would recommend the following: Consider clinical research and try to get published or present at IDSA. See if you can do a research elective to help you toward this goal. Find an ID advisor and do an ID rotation this year or first thing during third year so you can be ready to turn in your ERAS applicatoin. If you're interested in international work I would recommend arranging an overseas elective in addition to doing some clinical research (the research does not have to be related to the overseas elective).
Something else to consider if you're interested in epidemiology would be an EIS fellowship at the CDC. This is something I'm still considering doing though it is usually done before fellowship.
Here are some specific program reviews:
http://forums.studentdoctor.net/showpost.php?p=6816482&postcount=133
http://forums.studentdoctor.net/showpost.php?p=7661654&postcount=190
http://forums.studentdoctor.net/showpost.php?p=7661654&postcount=191
http://forums.studentdoctor.net/showpost.php?p=7661654&postcount=192
http://forums.studentdoctor.net/showpost.php?p=7661433&postcount=193
http://forums.studentdoctor.net/showpost.php?p=7661654&postcount=194
http://forums.studentdoctor.net/showpost.php?p=7699264&postcount=202
http://forums.studentdoctor.net/showpost.php?p=7696499&postcount=201
http://forums.studentdoctor.net/showpost.php?p=10518552&postcount=54
http://forums.studentdoctor.net/showpost.php?p=10768866&postcount=97
http://forums.studentdoctor.net/showpost.php?p=11160427&postcount=107
You can look up information on nearly all programs here:
http://www.idsociety.org/Programs/
https://freida.ama-assn.org/Freida/user/viewProgramSearch.do
Let me know if you have any other questions.