I hate the built-in flash. It just plain sucks, unless I get lucky with lighting or settings. I've finally started to get the knack of snapping Virgo indoors with flash, but the pics still come out so much better if I just use a slower shutter speed and more light.
You can get some great kits on ebay or Amazon; eBay is where I got my D50 kit....body, three lenses, three filters, two carrying cases, two tripods, all for about $800.