Since we're both former Tomato users (I still use it as a wireless 5 port switch), which of the those did you choose or know which replicates most of Tomato's Bandwidth stats?
From my understanding, they require full installs, I'm not using a microdrive or a hdd, but a CF card and the newest 1.2.3 rc2 nanobsd requires the packages to be re-written to be fully compatible. I tried an early 1.2.3 rc2 for embedded had issues and I had to drop back to 1.2.2.
I'm on an Alix 2d3 board, can't stand using an old noisy pc for pfSense. :-)