Unfortunately, those don't run fast enough for me to consider them competition to VIA. 1.3 watts max is great, but when you're only running 400mhz, that's easily doable. VIA is managing ~1ghz with 1 watt, 1.5ghz with ~3 watts, 1.5ghz with ~7 watts. That is an incredibly small amount of leakage!
For the record, anything under ~5 watts can easily run on Tiny-Aluminum-HS passive cooling, in a box with no airflow. Anything above(7-30 watts?) needs slight airflow.
I was just checking VIA's site, and stumbled across this:
And you've got all the pico-ness lol