The 2D13 is a fine board for light use, I have one at home. It works well for connections up to around 50/50 as long as you don't use any memory- or cpu-heavy options (like the ones I mentioned). If you have need for snort, L7, VPN, etc then you should consider an Atom or something else faster.
As to the Soekris net6501, I'll believe it when I see it. I seriously doubt that it will be available in a couple weeks.