I'd never even heard of 3D Coat before. Looks ZBrushy...
Construct 2 on Steam could be a good move, if Valve doesn't mind providing competing software (they probably wouldn't, but you never know)
However, at first glance Construct 2 looks pricier than Game Maker. So if Construct would go up on Steam there are things to take into consideration.
The pricing and that Game Maker has, sadly, much more recognition as it stands. People know what Game Maker is (the name also kinda helps in that regard).