Hi,
Have you seen this?:
http://en.wikipedia.org/wiki/List_of_game_engines
When it comes to game engines, in my opinion, a game developer with good, strong experience in 2D and 3D content creation has a huge advantage in navigating any workflow pipeline of the major engines. Since you did not give us hardly any details about your experience and skillset, how can we make a reasonable recommendation?
Assuming that you can use 2D and 3D asset programs, sound editors, and some specialized code generating/compiling tools such as GUI SDKs, then you should be able with community help realize a workflow which suits your abilities. If you are purely a coder, then in my opinion you have only half the skillset needed to use the game engines - all of which are content pipelines. All of the game engines are created to provide you with most of the coding done already so you can focus most of your time on content creation, game functionality, and other direct end-user impacted issues.
I know for a fact that MonoGame has a pipeline in place, but you have not done your research into documentation, folder/file READ-MEs, tutorials, and simply asking the MonoGame community for direct help on specific needs of yours.
Research is the intellectual backbone of game development. The more thorough that you are in research, then the more capable you will be as a developer. It is safe to say that in the course of a week, you should be spending a substantial number of hours in research alone.
I let you know these things to help you and not to deride you.
Clinton