im a 17 year old girl, i have ahuge interest in photography ad finally my dad said that i can get my first good decent camera but the thing is!

i am having a hard time choosing which camera i want between a

CANON EOS 30D

or..

NIKON D80

what adive or opinions do you guys have anyone help me out here?
this is my first camera i want to be real into it and learn everthing about it and i dont want to keep changing brands i want to stay with just one which one do u recomand for a young girl who is learning aobut photography and will use the camera professionally

can anybody help me please!!!!

THANKYOU!