Usually, Canon VS Nikon threads don't end too well for the TS. I think you should compared Nikon D7000 with Canon 60D. It would be a fairer comparison as the D90 is an older generation camera. Have you actually held either one of the cameras? Sometimes once you hold it, you will know which one suits you more.
Go to the shops and test hands on there. There is no ideal camera, you have to make compromises everywhere. Finally, your skills will have more impact on the pictures.
Also, you don't need to start threads for all possible comparisons: http://www.clubsnap.com/forums/showthread.php?t=835632
Read through this guide, read reviews, make yourself familiar with the technical terms, finally: make your own decision. We can help with specific questions, no issue. But such genereic questions about various models will not yield any clear answer. Too many options, too many personal preferences involved.
TS, just a kind reminder to avoid those bad reputation shops and do your homework on the pricing before buying. Make sure you test the cam and lens before payment hor, else will see you start a new thread later. :bsmilie:
If you have friends who are already into this hobby, ask them along.