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@crank
These people list 6000-2rs bearings at between $2 and $250 a pair depending on material..
There seems to be a big difference between 'hybrid ceramic' ($10 ea) and 'full ceramic' ($60/125 ea) - not sure what it is.
Bear in mind that the lowest quality rated bearing (Apec-1) is designed to fail at not less than 32000RPM (That's 42 miles a MINUTE on a 700c wheel).. and that apparently quality of bearings is designed to give the bearing a higher fail speed, rather than less friction at low speeds.
I reckon I would rather get some cheapish name-brand bearings (SKF, etc.) and replace more often. To reduce friction, you could also think about getting -2RU or -ZZ bearings rather than 2RS.. this means that the bearing has a shield or seal, but the seal has a little gap in it and therefore does not touch both races (lack of contact = reduced friction, but less gack-proof). Also, different kinds and amounts of lubrication make a big difference to torque. I'd be interested in experimenting with some strange combinations and seeing how they run.
This page explains all the bearing variables quite well IMO.