My general impression from reading past threads about the lower cost custom options is that few if any were satisfied with the results. If you don't need the suit immediately, it might be better to save a bit longer so that you can raise the top of your price range to $800-900. At that price, you'd probably be able to use Kent Wang, who has a physical presence in NYC and is known to produce results in the acceptable to very good range. I would be very surprised if anyone is able to identify a reasonable option for you at the quoted price, but I hope I'm wrong!
I'm sorry, I should have clarified: I understand SF's idea of "reasonable" is considerably higher than that of the average population (which I love!) but what I'm looking for is a "stopgap" suit that fits well, and doesn't make me sweat (i.e. summer fabrics and partial or no lining).
I think I understood generally what you were looking for. I guess I should have been clearer myself: my general impression is that people have been dissatisfied with the custom makers at that price level because the results have been poor by any standard, not by SF's standards. There are mistakes in the measurements or mistakes in how the measurements taken are translated into a cut garment. The jackets come back too short or too big or tight in weird places or with major problems with things like sleeves. The pants come back too tight and poorly fitted. People get remakes, but the remakes aren't significant improvements.
My point is that I'm skeptical that anyone is going to give you a recommendation at that price point that you haven't already found that's going to result in something that will be a meaningful improvement over OTR and won't be just as time-consuming to deal with as bargain hunting. That's why I suggested saving for a bit longer to be able to work with someone who seems to be able to deliver.