Thiel 1.5 vs. 2.3

Thanks very much to everybody who replied. I have some space limitations, which make me lean more to the 2.3 rather than 3.6, but I will think about this again in light of what's been said. I do _not_ like bright/harsh sounding gear (but neutral is good, i.e., not syrupy, which Thiels certainly are not). I have a Modulus 3A preamp, a VPI HW-19 Mk IV turntable, and at the moment a set of Golden Tube SE-40 monoblocks (80 wpc). I am aware that I would probably need to upgrade the amps. I also appreciate the cable recommendations, particularly if this helps tame excessive brightness, as I have not used MIT or Transparent cables before (I have an older pair of Tara Labs at the moment).

Thanks again to everybody, and particularly to Art for the very clear comparison of the various Thiel models. It sounds like the 2.3s would do what I'm looking for. I'm trying to walk a fine line here; not bright or harsh, but not euphonic or or otherwise colored. I've never had trouble making my 1.5s sound good (probably because I have always had some tubes in the system), although I agree that they like all Thiels are very revealing of what's on a recording.