In a few weeks I will be going to Tampa via Baltimore.  I will be taking SWA  and I would like to know where do you think is the best place to sit on the -700 or -300?

On any airliner, the first emergency exit behind the wing is my usual choice, because aside from the obvious safety enhancement, you get more elbow and leg room at an emergency exit.

in a -700, seat row 12
in a -800 seat row 14 and 15
The above are the emergency over wing exits and the leg room as much greater.
In a -300, take sleeping pills

Matt