GW are currently asking people for their choice of favourite miniature. There are some interesting and impressive models in there, but I'm not sure I'd call many of them contenders for my favourite.
Out of the ones on that page then Karl Franz is great as a classic who still looks good, the old giant has nostalgia appeal, and the Green Knight was always good for detail (although I think half of it was actually achieved with paint). The new High Elf dragon is certainly one of the more interesting recent releases with its variability. I'm not quite sure what I'd add to my own list.
What about other people? Do any of those jump out as great or is there something you think is missing off the list?