Posted By:
Steve M.Anything that I start to collect. 
Seriously though I see continuing strength in Zeenut issues, especially 1911, 1912 and 1918. C46 may be a sleeper. I completed the set many years ago and sold it for a pittance. Still like it and have given some thought to starting over. I see renewed interest in the set.
I personally like "brown". 1911 and 1912 Zeenuts; C46 and T207 and don't consider them dark and moody.
Finally, I think d310 and d311 Pacific Coast Biscuits will experience a price rise in 2007. There is a lot of competition for these issues.