I am going in with an open mind, but I do have my likes and dislikes.
I'm very sure that I don't want: IM and its subs, FP, Ped, Derm, Rad, Uro, Ob/Gyn, and Path
I always fantasize about:
EM: love every aspect of it (fast pace, different animals, instant results, flexibility, and residency length)
Ortho: happy patients, instant results, aggressive approach to fix problems, and off course prestige
ENT: Interesting anatomy, balanced mixture of medicine and surgery, cool toys, happy patients, lots of bread and butter, many selective procedures
General Surgery: many options to subspecialize in other cool areas (CT and Vascular), hold people's internal organs, fast results, comprehensive knowledge of medicine and surgery
Gas: get to play pilot (no need to fly the plane, but always ready when something goes wrong), great knowledge of many organ systems (cardiac, pulm, etc), opportunity to subspecialize in cool areas (sleep and pain), relatively short residency, plus you get to post with the cool guys at the Anesthesiology forums (Blade, Jet, and others)
I also love the nervous system, but not sure if I could do neuro as a career...too slow for me.
At the end, I'm still a pre-med and will most likely have different points of view once I start my rotations.