So out of all the officially released Space Quest games, which one is your personal favorite and why?

Mine was a little tough to decide between III and IV, but I picked IV. I loved the story in this game. It had an awesome opening intro and I found it probably the most funny out of all of them. The time traveling aspect of it was a really awesome aspect of the game. I loved jumping from SQIV to XII and so on. The best part of the game though IMO, is when you get to travel back to SQI and revisit the little desert town. I also loved the mini games like the burger joint one, and all the funny references in the mall, like Big & Tall and Radio Shack. The final battle at the end of the game was also a pretty damn sweet battle.