Unless heated, the tile will always feel cold. The wall heater won't help the tile much. In-floor heating if only for comfort, not keeping the room to temp doesn't need much current. I'd check warmfloors.com for some suggestions there. You could also use a timer but that wouldn't help in the middle of the night!
Check out www.johnbridge.com for help on tiling. They have a bunch of projects where they've done in-floor heating and you can see what others have done. In-floor radiant is a luxury - very pleasant. I'm not familiar with DUraceramic (is this a floating floor?). You may get some opinions on that at John Bridge's Tile Your World site as well. In general, durability of the 'faux' tile isn't very good and their so-called grout isn't very durable.