Well, it had to be Q3 really, didn't it - it's the best, and definitely the most technically advanced, game ever to grace an Amiga. Quite amazing that bigfoot managed to port it to MorphOS in just a few hours.
Looking at the list, they're all MorphOS ports if I'm not mistaken. Was nothing released on the classic OS in 2005? I guess Desert Racing was too late to make the list.