Hi Opus88,
While I do not have any experience with your Air Tights and do not doubt or question the findings of Noble111 (yes, I saw the other thread on the recessed soundstage concerns), I can tell you that my own experience with the Supratek is pretty much the opposite of his. In my system, the First Sound, while very dynamic, quiet, and "clean," had a presentation I felt was compressed compared to the Supratek. I would not characterize the soundstage of the Supratek as overly exaggerated or overly forward, but it feels dimensional and "correct" to me. I realize matching components is an issue, but I seriously doubt the Air Tight would pose any problems.
There is a good reason 90 percent of Supratek owners still rave about their units, only looking to upgrade within the chain.
No affiliation with Supratek, just a lucky owner and big fan.
Let us know what happens if you decide to take the plunge.
Good luck.