I don't have enough mono records to justify the purchase, but if I were in your position I would look at both the Miyabe Mono (reviewed by Art Dudley in the Dec '08 Stereophile) and the Miyajima Mono. The latter is a new entry you can read about in Jerry Siegel's review:http://www.10audio.com/miyajima_shilabe.htm
As a reference point, Jerry's previous reference was a Benz LP in a Triplanar. (I would gladly settle for a Benz LP......)
I really like Sketches of Spain. I had a somewhat scratchy stereo 6-eye that I played for Thom when he heard my system way back in 2004. I bought a reissue from Classic I believe, thinking it would be an improvement. NOT!! However, with a little patience, I was able to find a near-mint stereo 6-eye, and it sounds great. These "audiophile" reissues almost always sound inferior to the originals, in my opinion at least. I would much rather put up with some noise and even some occasional distortion from previous owners than listen to the squeaky clean reissues that have managed to scrub all the musical life out of the recording.