[Ryland]

Of all the disk brakes out there that are going to give you the least number of issues and give you next to zero drag, the Honda Insight calipers should do the job, they are an aluminum caliper instead of cast iron (lower unsprung weight) and every part of that car has been designed for fuel economy and all it takes to make sure that you disk brakes are not draging is longer throw on the return springs so that you are assured to have a gap between the brake pad and the disk, if there is a gap then there is nothing to drag.
There are a lot of Honda Insight parts that might help you out, rear brake drums are aluminum with iron liners, I have a set on my civic vx and they are a perfect fit so they will fit the CRX as well saving around 3 pounds of unsprung rotating weight and if you want to get really nit picky, you can even get the aluminum wheel cylinders that the insight has, they cost a little more then the iron parts but they'll help cut your weight down even more.