Well, in the world of dSLR, no. Most of the decent lenses will most likely cost more than your camera itself (I also have a D50).
However, it really kind of depends. Depends on what you want to shoot; sports photography will most likely be way out of your limit (fast lenses are quite expensive). However, if you only want to shoot portraits and candids, you can get decent fixed lenses for fairly cheap (i.e. 50mm/1.8 = $80). Although, better prime lenses are upwards of $300 easy.
Fast telephotos are even more expensive. A great all-around lens that will suit most of your needs is the 18-200mm VR, which runs around $800, but it's a great lens, and makes up for much of the need to get a variety of lenses. But again, it depends what you want to shoot, and what range you are looking at.
The reality of the dSLR market is that good lenses are almost always more expensive than the physical body itself, that's why most will say base your decision on a body on the lenses you intend to strap on it, because the lenses and their quality will last longer than the life of the body itself.