All you need is Tai Bo... he's a real martial artist, you can get a black belt in a few short study sessions. Why subject yourself to all the traditional styles, just learn the best.
(sarcasm)
Feet placement
Maybe it's me, but I was always taught that it is good to be rooted. That way you have some place to develop the power from. I was also taught more power came from the hip rotation rather than the legs too, so who's to know. I was shotokan, so I guess it depends on the school...
Nair
I can honestly say nair is twice as annoying as shaving.. being as how you have to use a fair amount and it smells like shit... I'd say stick with shaving, takes me an hour+, but hell, do it in the morning or something.
I actually gave thought to going out for the "cheerleading squad." Except i'm a little weak in my acrobatics. I just think it would be funny since I am bigger than some of the players.
No need to kill off training
I workout 4(or 5) days a week and I train in martial arts twice a week. I find no problem training in martial arts after weight training. The only consideration you need to take is priority. If you are a bodybuilder first, martial artist second, then consider...