Welcome to the World of Photography !
Buying the first camera is always a challenge.
I believe you may wish to start off with a relatively basic DSLR like Canon 450D or Nikon D40. These models can last you for at least 2 years before you start looking for higher range of cameras when your skills has surpass the camera's capabilities - high ISO or Full frame or others.
Yet end of the day ... though the camera may made the difference in the quality of the picture ... but i believe the creativity in you is more impt and will set you apart from others!
Have fun shopping around - and to me ... that's the greatest joy - Shopping for Camera stuffs !