Thanks Rowdy, I actually had seen and considered those! The more I think about it, read about the various topre boards, and look at the pictures you guys have up in the "Post your Topre Keyboard" thread, the more I lean towards either a white HHKB pro 2 or a black Realforce 87U 55g. Especially at that price point for the fc660c. It's a good thing I'm the type to think things through a hundred times, or else I'd have just bought both by now.
Now I'm feeling unsure about how the 55g actuation would feel relative to the ~45g-ish, considering I've never had the pleasure of trying either.