This one is reputed to be better than CDI but very inexpensive.
Alado Nautica USA Pricing Page
Harken is reputed to be the easiest to self install of the "real" furlers.
The CDI and Aladous do not have a top swivel which makes them much less expensive.
They work ok but you can get better tension and sail shape with a furler that has a top swivel.
In all cases you should check with your sailmaker to find out how much it will cost to remake your sail. It will certainly be a few hundred so you sail has to be worth putting that much into it.
Also if you head stay is not wonderful this is a good time to replace it as it will be hidden and harder to survey.