It's Peds, guaranteed, with EM also very high up there.
I'm basing this on people outside of medicine, because personally I don't want to date anyone in medicine...
1. You have to keep it recognizable - the point's already been made that the specialists we consider huge studs often don't seem all that impressive to people outside medicine - derm, rads, ophtho etc...People don't know what they do, don't know what they make, nor do they usually care about our own medical hierarchies. I think most people in the country would be VERY surprised to learn which specialties are most competitive to get into.
2. Everyone knows surgeons are jerks.
3. I would also argue that money isn't as big an issue as you'd think. As much as we worry about it, all doctors, primary care included, do actually make a lot of money. Generalists do still make way more than any national average, and probably way more any the random average woman they happen to be flirting with. 150k still sounds awfully impressive to a lot of people, especially those who are not doctors.
4. And women just do like guys who like kids. If you pick me a random woman out of a bar and gave me just 10 minutes, I'd take my chances with peds over just about anything.
Peds EM, I suppose you could make a woman orgasm by looking at her and saying "booya."