Teac's and Mitsumi's are old favorites, NEC's aren't bad, but personally I've been using Sony floppies for the past few years. I've yet to have one die, but have had some Teacs and Mitsumi's die prematurely.
Some say "it's a floppy, who cares!" but I take care to pick out the Sony's...9 bucks just like the rest, but IMO they work well.