I haven't made a purchase yet, but if you could fit the equivalent functionality of this board:
http://www.logicsupply.com/products/ms_9801
In the Bubba chassis with the Bubba software, and support Slimserver out of the box, I would purchase it without hesitation.
Should give enough juice for a while, and since the Geode LX is the proc in the OLPC project, you know people will be optimizing code for it.
Only thing that board is missing is a SATA connector.
Just my two cents
