Hey guys! Ive decided i need an external flash for my nikon d40x as the built in one is not efficient for the night shots of bmx biking that my friends and i do. MY one friend who also takes pictures (rebel XTi) has a speedlight that is very very nice that he bought used for a 200 bucks. This would be my logical choice but i dont have that much money and im currently saving up for a new lens(70-200mm) for shoting things like track meets and other stuff like that. So what i need to know is what would be the best flash to get for say under $100? OR would it be a better idea to wait until i have enough money to buy a better flash? Keep in mind im not into this to seriously i would probably not take advantage of more expensive flashes Thanks a bunch guys!