Hey Rowdy
Yes, I'm a big fan of topre. As for my favorite board, it's really hard to tell. My 55g has a satisfactory "punchiness" to it that the other boards just can't touch. But I certainly wouldn't use it for sustained typing as my fingers tend to get tired after a while. For long periods of typing, nothing compares to my HHKB Type-S. The buttery feel of HHKB just feels so natural and I'm a huge fan of the layout.
As for my 660C, I'll be modding this week in hopes that I can get it close to the Type-S. If not, I may have to sell it off as it's currently unused