KK,
The 90X is a new model above the 901. Somewhere around $2700 I think. Here's an ad (which hasn't changed in months):
http://show.audiogon.com/cgi-bin/shm.pl?anlgcart&1059705304&item&Audiorevelation&4&5&6&http://cgi.audiogon.com/cgi-bin/fs_srch.plQQANYAAAApurlsrchAAEXYAAstAAAAAA90x
I haven't heard one I'm afraid.