Flower Shot

Just screwing around out in a field. I wish so bad that I had a macro lens but this is all my current lens has got! I droped the quality to make it 56K friendly.
http://i102.photobucket.com/albums/m112/sypher2112/DSC_0202-1.jpg
I'm really wanting to dive into photography but need a new lens. I have a Nikon D50. Any suggestions?

Sigma 50 or 105 macro. Oh wait, lens in general??? What do ya got? D50 used to come with a pretty nice kit lens.

I know more than just Canon. Mainly 3rd party lenses but I've had my experience with noink.