For a boat as small as yours, there are only a few possibilities. CDI is a good product and probably the most inexpensive, but an optional ball bearing drum raises the price some. It works well without it, actually. CDI uses its own halyard system, so your existing halyard will not be required. A second choice is the Schaefer Snap Furl. It uses your existing halyard. Both CDI and the Snap Furl have flexible extrusions which is recommended for a boat where the mast is raised and lowered frequently. The chance of damaging it, in comparison to an aluminum extrusion is small. Installation of either of the above systems is fairly easy for the boat owner. Another company who builds furlers for boats of your size is Selden. Called Furlex, it is more sophisticated and has an aluminum extrusion. It uses your own halyards and the kit not only includes the furling parts, but also a new forestay. This is to assure all the components of the system are new. You aren't putting a new roller furler on an old forestay. Also, the Furlex kit includes the furling line and the stanchion blocks to bring that line aft to the cockpit. So, with CDI and Snap Furl, you need to shop for the blocks to bring the line aft. The Furlex installation instructions are more involved, but they do a good job showing you how to construct the system. It is by far the best of the three mentioned, but maybe you don't need the very best, too.