I like... our Milky Way? It's pretty neat.



Here's a nice big pic of it: VISTA gigapixel mosaic of the central parts of the Milky Way

Saturn has been my favorite planet since I was a kid. The rings must be a novelty or something. Venus is also up there now, just because there are a lot of awesome colonization theories behind it that don't deal with terraforming. The moon is also cool.



Nebulae are fun to look at.