The Artemis DH isn't any different from the normal artemis with the exception of its slight model alteration and textures. It's stats are exactly the same.
The Ares one of the best fighters in game. Equip it right and you own almost any other ship. Personally I'm a sucker for the Kayser/Maxim combo. Maxim is great if you can learn to aim it right, especially at long ranges. A nice selection of what ever missiles are most effective at the time is also useful. Trebs are good, but I still prefer my harpoons.
How about Hornets versus Tornadoes. For the extra 300 metre range and half second less lock time are tornados worth the extra cargo space over the hornet swarmers? I know some people still prefer hornets over tornadoes, but I'm curious as to see who.