Nice list, Brendan - I would have added Amyan but Alexander beat me to it.
At the higher end of the spectrum, let's not forget about Hakkapeliitta and SmarThink. Also, I'd mention Alfil 15.07, ok, maybe less original than most, but just look at the style - it is one of the most brutal attacking engine players out there. Chiron is also a fine attacker and Hannibal's earlier versions could play quite speculatively at times. Fizbo can be a wild attacker, too, if you take a look at earlier versions rated between roughly 2800-2900.
I think Komodo 10 can also be tweaked into a modern kinghunter
mode, if you know what I mean.
Just play around with those parameters...
Further down the rating list I'd have a look at Gaia. I haven't had much time to test it, but it has an interesting reputation as a more strategic player. Also, earlier versions of Ares were supposed to be more human-like.
EDIT: CSTal deserves a mention here as well.
Just trying to compile a list of the engines that play in the most beautiful, positional, aggressive, human-like etc styles.
You guys are the experts...let me know if I've missed any.
- Zappa Mexico Dissident Aggressor
Deep Fritz 10
Frenzee (Capablanca-like play in my opinion)
Hiarcs 8 Bareev
Deep Junior 7
Prodeo (numerous great personalities)
Wasp (a new fav)
Toga 3.1.2 Checkov
Thinker (a few versions I love)
Rybka Winfinder 2.2
King 3.23 Tribute
Rhetoric (material at 50)
Hiarcs 2007 Paderborn
Gambit Tiger 2.0
Rodent II Henny/Remy
Gambit Fruit Cognac
Twisted Logic Cognac
Maverick 1.0 (nice aggression in several types of position)
Little Goliath Evolution
Clearly I'm a guy who cares more for style than strength.
There are also a handful of personalities I am working on but still testing.
Have I missed any great current or historial engines in my list (which is in random order I should mention)?