I own a Nikon D200 and I have been photographing in dim light a lot lately. I have been currently using my built in flash, Iso 200, shutter speed at about 200, and my white balance is on Auto. Personally I think the pictures really stink. I am looking to improve the quality of them. What kind of equipment would I need to purchase to make my photographs turn out better. What kind of flash would I need to be using. Do I need to change my settings around? Thank you for your help.