Hardly an expert, but what about your center channel don't you like? As I see it (being that all I ever use mine for is movies) my biggest concern / consideration is not so much what the center channel does, but what it doesn't do -- specifically, sound any different from the mains. Ideally, as I see it, the center should be just as similar to the mains as possibe, in the hope of presenting as unified a sound across the front as possible. So, personally, being that the noisy bits in the mains are coming out of Thiel coaxial drivers, putting a Thiel coaxial in the middle seemed a no-brainer. It's an unavoidable by-product of using little vibrating bits to reproduce sound that you'll get particular sonic signatures from each iteration (yes, in the camp that a sonically "neutral" speaker is one of those mythical beasts that hangs out with the likes of Santa and the Easter Bunny). With all that in mind, I've always understood it to be the conventional wisdom that staying in the family (as it were) with the center and the mains is the way to go. So why the urge to break up your little Martin Logan family? (This, not coincidentally, doubles as my hypothesis as to why you don't see a lot of center channel recomendations -- once you've staked a claim on the mains, the center picks itself. But, then, perhaps it's just me.)
