The IntelliChlor is generally well though of, but it is normally a little more expensive and isn't usually the best choice unless you also have a Pentair brand automation system. The Hayward Aqua Rite is very well thought of, also a little more expensive than the EcoMatic or CompuPool.
There is a good article in Pool School on adjusting your levels for use with a SWG. Depending on how much you already know you could start there, or read some of the more basic articles first.