The IMCTH models are definitely expensive, though I think they are starting to make their way West and thus becoming less the dent-in-the-wallet. For a long time they were only available via Japan, but this looks a like a viable option for those of us in the 'States at least.. finescalemodels.biz
I bought a Desktop Mustang from IMCTH back in March and am currently planning the painting process.
Also, I had never heard of the DeAgostonini Zero before now, but am sure glad you mentioned it! Wow!
-Tommy