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If 100M is enough for you, I'm developing a new board with 2 RJ45 for industrial ethernet, which has a 40 pin connector compatible to that of RPi B+, but the circuit is adapted from beaglebone black. It's scheduled for end of January 2015.

https://docs.google.com/document/d/1X9RrbkUpiTQ-S6Acken-5fv7...

I'm very interested in your board as it would probably make for a great *BSD firewall, do you have any contacts? as I cannot find any on that page.
Not sure what your budget (power or $) is, but I use this for an almost identical situation:

AMD fanless barbone w/ dual NIC (Jetway $215) http://www.newegg.com/Product/Product.aspx?Item=N82E16856107...

SSD 64GB ($62 sandisk) http://www.newegg.com/Product/Product.aspx?Item=9SIA4UB22Z51...

4GB RAM (no ECC) ($38 gskill) http://www.newegg.com/Product/Product.aspx?Item=N82E16820231...

So, $315 and ~15W max. I bet this could serve a small office well. Someone should get this down to $200 with minimal specs (and no video or audio).

It has dual Realtek NICs; it runs pfsense and openVPN well, and you can also run squid and snort if you're into it (I haven't learned how to use them yet, but I plan to).

Try the PCEngines APU board! http://www.pcengines.ch/apu.htm

The only downside is it uses Realtek NICs instead of Intel ones. Otherwise it's pretty much perfect.

Where can I buy these?
Try http://store.netgate.com/mainboards.aspx (assuming you're in the US).
I'm using http://tostarcn.en.alibaba.com/product/1955500912-222121763/... and it was worth the $170 I paid, really.
Do you think there's an advantage of using this over an Intel NUC? I'm looking for a low power board to replace an aging Dreamplug [1]

1: https://www.globalscaletechnologies.com/t-dreamplugdetails.a...

The mirabox has dual ethernet and arch linux support is good. The box is a little expensive and I have never got wifi to work but as a router/firewall it does the job:

https://www.globalscaletechnologies.com/c-14-gtimirabox.aspx

The Novena board looks pretty shiny for this. Mine should come in any day, and I plan to at least try it out for this purpose. Unfortunately it isn't dual gigabit though, so it'll bottleneck my internet a little bit.
You can stick an USB NIC or two in it, if 100M ethernet is enough.