Shortening my short list – Thiel 3.6 vs VMPS rm30?

FWIW, as others have pointed out, the Thiels, with their greater dispersion pattern will create a lot of problems from reflections in a small, hard room.

The RM30's on the other hand are more directional and are made to be canted in toward the listening position. This provides less room interference and a more direct sound from the speakers... In your situation, the RM30's would be the logical choice. I mean, why beat your head against the wall trying to get the Theil's reflections under control???

YOu would be amazed at what a fine pair of monitors (<$1500 used) sound like with a powered sub

I can't usually get a powered sub to blend seamlessly with satellite speakers and I have tried.

But another great option for a small room is a pair of the svelte Silverline Prelude speakers... Their high efficiency makes them easy to drive and they don't need a sub unless you're a true bass freak. Right now I'm driving mine with an ASL 1003DT tube amp (30Wpc) and they sound just marvelous in my smaller listening room. My VMPS, on the other hand have too much bass for the small room and can overload it easily.

You might be amazed at how monitors sound with a sub but nowhere near as IMPRESSED by the large full body experience of a VMPS, and you wont have the hassle that integrating a sub may give you.
As a VMPS owner myself (FF3SRE) I can tell you that the VMPS models make the room much less of an issue then many other models...........I think you will be all smiles.

Thanks all for the valuable feedback.