I'm wanting to get an Xbox 360 and primarily use it for playing downloaded games, both 360 and original Xbox games. What type of 360 do you guys recommend that's the cheapest and easiest to mod for this purpose? From what I've researched, a Slim with Xkey is the way to go, I'm just not sure what type of Slim is best, or if it can run original Xbox games. I don't care about Xbox Live.