Like I said before, always best to go with more watts than you need when heating a large tank, better to have your heater not working very hard than trying to work hard because the watts are not enough. You also have to think about the ambient temp of the room. I use 50W heaters in my 10g tanks, and they hold at 78F, but my tanks are also only 76F with no heater because of the temperature of the room. Now, if the room is naturally 70F without a heater, 50W will not keep a steady heat in your tank :) I would support 100W heaters for 10g tanks for sure, just to make sure everything is covered. I'd have them, but 100W heaters here are about $40 each. Eek. And also, best to just go with something that covers all your needs, instead of something that doesn't and then having to upgrade down the road. Much cheaper.
About all the other stuff going on, I'm choosing to walk away and not discuss it. I know what I said wasn't wrong, the OP doesn't hold anything against me so I'm good :)