Thanks for the replies gentlemen.
I was prepared to buy a Candela, but I am not that patient. As it is, I have been trying to stay in my budget, and I feel I got a great deal on the Mercury. The Candela looks to be a couple months out yet, and so I just went for what I can get now. Was also very interested in a Modwright, based on favorable reports from other Mono users. Rosconey, have you tried any other tube gear with the Monos?
mgalusha, thanks for the report regarding the ultraverve. One of the reviews I read mentioned that the Ultraverve actually had better low end than the Mercury, and the Mercury shined in the mids and highs. I expect the Mercury to sound great, though.
Thanks dudes.