I think a lot depends on your 3rd year medical school performance.
The 203 on step 1 isn't that big of deal if you are interested in any noncompetitive specialties like peds, IM, fp, psych, physical medicine/rehab, probably neurology. Especially if you could do a little better (like even 215-220 or so) on your Step 2 and definitely to pass Step 2CS on the first try. I wouldn't obsess about the low Step 1 score...you didn't fail and that's actually not the worst score in the world. I mean, you aren't going to do medicine residency at Johns Hopkins, but unless you want to be an academic who does basic science research, I don't think that matters. The Step 1 score just tells you that you need to be careful to study/prepare well for Step 2, but really you can take that even some time into 4th year and it's OK, so you'll have time to study.
The biggest thing I would worry about with the 3 years off is that you have forgotten a lot, particularly in terms of clinical skills. What 3rd year rotation did you already do? Just curious. Would your medical school consider letting you sit in on some of the 1st or 2nd year physical exam and history taking classes, and/or going with the 2nd years when they go see hospital patients? If you could do this for a few weeks before restarting 3rd year, that might be very helpful.
Your class rank doesn't mean that much...it will likely change after 3rd year anyway. If you could just be a middle of the packer that would be fine for a lot of specialties, even maybe ER and anesthesia. The big think is that you need to find something you like and are reasonably good at. I would try to talk with your school's career office and maybe some practicing docs, to try to get an idea of what specialties you might be interested in. I think if I had known that more before I started 3rd year, I would have done better overall.
You will have to explain in your residency interviews why you took time off, but if you do fine when you rejoin 3rd year, I don't think it will cause undue alarm interviewing for the less competitive specialties as long as the interviewer feels you are committed now.