The Contax RX is probably my favorite camera body. It's fantastic. Beautiful and as smooth as anything i've ever used. I eventually sold it in favor of an Aria, though - pretty much just a smaller version of the RX.
The lenses are great. The 50/1.4 Planar is special. I have the 28/2.8 Distagon, but haven't used it much. I did, though, compare it to the Leica-R 28/2.8 current Elmarit, and couldn't find anything to distinguish them from each other (limited variables, though).
I'm debating whether to keep the Aria kit, though. I just have too much gear. It'll either be the Aria or Zeiss Ikon that goes.... I would have sold the Aria last month, but it's very difficult to let it go. Contax made such beautiful stuff. Sorry if i didn't help with the GAS. I certainly understand the allure.