Hi,
the fully supported is the ASUS one.
ASROCK is used in AresOne XL in order to get the onboard Networkchip to working with AROS... so in other words it isn't fully supported (yet).
Minimum 40$ each sold AresOne XL will go into the Bounty.. well I am still not sure if it will be a bounty or a paid order job.. (whatever next week i need to decide) : )
Vesalia gives a damn good price. And in this good price is already a AROS fee included. So if you buy one fromt the free market please donate 20€ to a bounty ; )