This season, i plan on shooting my friends snowboarding, sometimes at night. By that time i will have a Nikon D80. What should i get in terms of flashes and light stands? I have been eyeing the Nikon SB-600, but will one flash be enough? and should i try to get a strobelight as well as hotshoe flashes? Basicly, i guess could someone give me an overview of what kind of system i should be looking for, preferably under $400 (for flashes). Also, how would you reccomend i set up the flashes?