I've used all of those irons and they all work great. You'll do fine with any of them. If you are making an order to Tower I would recommend that you also pick up a thermometer [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXB352&P=7]Coverite Pocket Thermometer[/link] . This little tool is invaluable when covering. It let's you set your irons for the proper temps for covering. Whenever I get a new iron I will use the thermometer to calibrate the iron, and I label the temps on iron for future reference. Never ever trust the temp settings printed on the iron itself, rather verify it with the Pocket Thermometer first.

Hope this helps

Ken