Hello Lauren. This question was discussed a few days ago.

http://nikonrumors.com/forum/topic.php?id=1453

But the quick answer is that the D90 is a great camera for a great price. However it will be replaced soon (sometime this year). The D300S will be replaced in early 2011 or perhaps late 2010. Regardless of the camera you choose it is your skill as a photographer that makes great images not how new or expensive your camera is.

Hey guys, I'm new here and I was wondering if I could have some input on a question I've been asking myself for the past few months. D90 or D300s? I currently have a d60 and I have rarely shot in auto with it.
I have a friend with a d90, and it seems like a slightly better choice just in price for quality. It isn't like I am a pro photographer (yet), and I am hoping to go to school for photography. However, I did also try a D300s at the photography store I work at, and I loved it. The thing I am most hesitant about is me out growing the D90 too quickly.
So basically this entire blurb can be summed with one question:
"Should I get a D90 then get the D300s (or it's replacement) when I progress more with photography, or should I just skip over the D90 and go for the D300s right away?"

Any input will be greatly appreciated!

-Lauren