I may catch a lot of flack for this, but for the last two of my first four brewing scenarios I added ice directly to the wort. My problem here is that my cold tap is 80 degrees; ice bath burns thru so much ice and the process is what I perceive to be too slow.
The method is fairly simple; you add ice directly to the wort. Now, you should NOT use ice from a retail store or even your own tap water unless it is sanitized first.
One week ago I did my first lager, and needed to get the temp of the wort down to 60 or less as fast as possible. I sanitized two 2-qt freezer plastic bags, filled them with distilled water (1/2 gallon each), and put them in the freezer two days before. When it came time to use them, set them out on the counter during the boil to loosen the bags up. I sprayed the outside of the bags with sanitizer just to be safe; and when the pot hit the sink, removed the bags and dropped these two huge ice cubes directly into the wort. Using a sanitized long spoon, I stirred them until they dissolved, which took about 12 minutes. The frozen water not only cooled, but of course helped increase the volume to the required five gallons.
This really worked well for me in getting the temp down as quickly as possible. I believe if you follow your sanitation procedures and use water that is also pure you will not risk contamination.
Good luck !