I see that AJ’s, Senters and Brasil’s have been mentioned.
Knowing bochurim who have attended Senters, I have a very high opinion of it. For those I know that have gone there it has done an excellent job. I don’t know as much about the other two, but I do know one of the yungerleit/rebbeim at AJs reasonably well, and the impression I get from him and others is positive. And Brasil’s also has a very good reputation, but I know little by way of details.
Imrei B might be for slightly older bochurim, and is maybe a little too far in the other direction from, for example, Lev Aryeh, but if it is actually the kind of place you’re considering, it is fantastic at what it does.