I hate ich. Here is what has worked for me successfully in the past:
Turn up the heater to above 80 degrees. Search online and you will find the exact temperature, but what this does is speeds up the life cycle. Ich is only susceptible to treatment after it falls off the host and hatches. I've tried all the different methods of medicating the aquarium and the heat works to quickly rid ich from the tank when combined with a medication.
If you are not planning on keeping any inverts (snails, crayfish, shrimp) you can try copper safe. That has always worked for me in conjunction with the increased temp.
Add a UV sterilizer to the tank. This will greatly reduce the likelihood of a reoccurrence.
And lastly, quarantine your fish prior to adding them to the main tank.
These are things that have worked for me in the past. Good luck!
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