Based upon the experiences of my classmates who took COMLEX only, I can say with absolute certainty that the following solid north-east programs will interview you w/o a USMLE score: Temple, Jeff, Kessler, JFK, Mt. Sinai, NYU, Columbia/Cornell. I'm not sure about Spaulding or the east coast programs south of PA b/c I don't know if the people I'm talking about had applied there.
This is strictly for interviewing though. I'm pretty sure you'd be given a fair shot at matching at most of these programs w/ only COMLEX, but can't say for sure, as I personally did have a USMLE score. That being said, classmates of mine got their number one choices at Temple and Jeff w/o USMLE scores.