I too am going with the live with an infested tank approach and have done so successfully for about 4 months or so now. Things you may already know, but the key to success here is: (1) maintain excellent water quality; (2) feed your fish the most nutritious food.
In this regard, regular water changes and use of carbon, GFO, etc is highly recommended. As far as feeding, I would soak food everyday in a vitamin supplement, add garlic to the mix, and if not already doing so introduce new life spectrum pellets into your feeding schedule which are highly nutritious. I also think that UV is useful here in that I feel it at least keeps the ich parasite count down in the system and helps to increase redox and overall water quality. Lastly and probably least popular here, there is one potion that I find helpful. There is a product made by Tropical Science called Marine Max which is marketed as a priobiotic tonic consisting of bacteria designed to crowd out the ich, antioxidents, and vitamins. It is by no means any cure for ich, but since I started using it I found my fish showing far less symptoms. It is completely safe to use because it consists of only bacteria, vitamins, and antioxidents. If you look around the web, you find others who have used it as a means to assist in the control (not a cure) for ich. I have been using it for the last month or so and noticed a significant improvement with far less flashing and no spotting on my fish (was getting some spots before on my pinktail trigger, who since using this stuff has been spot free and flashing only occassionally now).
Finally, I think the major hurdle is getting your fish to recover from a bad outbreak. After that, I have found that they seem more resistant as time passes, and although still infected, show less behaviorial and visual signs as time passes, perhaps suggesting that the fish immunity improves and/or the verilance of the infestation becomes less based on the idea that you can only have so many generations of a single strain, or a combination of both.
