Well, it depends what armies you're thinking of -- the newer undead regulars and characters are all quite nice, the elves all seem good. I quite like most of the Orcs; although the naval crew was a bit disappointing. The dark elves guerillas are really nice.
The toad regulars are, I think, my favourites[1] but I'm less sure about some of the characters.
Between that array, you can get a lot of playable sections with nice figures; in a lot of cases without repeated sculpts.
There are pictures of my paints of a lot of those ranges on katiethewargamer.blogspot.co.uk
[1] They're just so much fun and the figures are fantastic.