I use a 3/16" polyester double braid from West Marine (by New England Ropes)-- slightly smaller and more flexible than the Hobie line, reasonably priced (especially on sale) and has a reasonable grip. Here's what it looks like (you can get different colors):
This snaps on and off the sail and can double as an emergency tow line.
You should get more than you think you'll need -- can trim it later. You'll find lots of uses for the left overs. for instance, short (5') lengths for quick tethering of gear as necessary. Here's another piece used as a permanent loop for securing the sail when stowed:
Also, if you adopt MRL's excellent rigging suggestion, you'll need more line. Shown here is a similar set up on an Oasis:
(You probably would skip the cam cleat for the Revo unless also using the Sidekick for improved stability).
For your furler, you might look at 3/16" or 4mm line. Just guessing though as I don't furl the small sail. You need it to wrap nicely around the small mast yet be easy to grip.