I have never included a piece of DLC on any of my GotY lists. If it was something like Fallout 3: Point Lookout then I'd probably consider it. I wouldn't put a piece of DLC and the game in the same list though.
I've run across the port problem before with Silent Hill: Shattered Memories. The game was released for both the Wii (2009) and the PS2 (2010). Though I had a Wii at the time, I waited for the PS2 version and decided it was ok to put it on my 2010 list.
I wouldn't include 1 and 4. That's just me though, don't let people judge your list.