Yay! Videos!
--Ahem. Ask yourself why you want to restart the game. What are the reasons behind it, and if you want to spend... the time you will need to get what you have by now, and how much of what you have now you don't like or you want to change. Sometimes one thinks about "new engine" or "restart this game", just to conclude that, you're trying to get almost the exact same, but with other graphics!
So, dunno, the choice is yours. You know what you want. Cheers!