I'd go with linear T8 fluorescents, but I'm not sure they'd start when the weather gets *really* cold.
The garage has open rafters, so I'd like to use some kind of reflector. I looked for some RLM reflectors, and was shocked by how expensive they are. I expected them to be about $5 or 10 in the electrical section at the local farm suply store, but they are about $35 each. Internet search turns up over $100 apiece for common RLM fixtures! I guess they are not so common anymore. I almost bought a pair on eBay: <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item#63199653 but I quit bidding kind of low because I got to thinking, "what is the cutoff for these reflectors? Will 2 fixtures like this light a 22 x 22' room with a ceiling height of 8'?" They might only light a circle area right underneath the fixture. It would probably take at least 3 or 4 fixtures to do it right.
How about if I paint a cheap 14" steel pizza pan flat white and center it directly behind each 4" octagonal box? Would that reflect most of the light that would otherwise go up in the rafters but not cut off any of the light to the sides? If properly done, would it still look stupid? :-)