Is there a particular reason you are committed to Levinson amplification? I have Revel Salons, and before buying the Salons, I listened extensively to the Studios. I heard them both with Levinson amps, and then with Jeff Rowland amps. I agree with d edwards that the speakers sounded somewhat dead with the Levinson amps. They came alive with Rowland. I ended up getting the Model 12 monos. I have heard that others using Revel speakers have also been very satisfied with a Rowland/Revel combination. If you like the Studio (and there are many reasons to like it), you should consider Rowland. Rowland's new 201 and 501 monos are supposed to be great amps, and at very reasonable prices (for Rowland).
I have no experience with JM lab.
I have no experience with JM lab.