Nikon d90 or d300? I'm definitely set on a Nikon, and I'm tirelessly searching through forums and reviews on both the d90 and d300. I really have not a clue which is better. I'm an art student switching from a 35mm film Nikon N65, so my knowledge on digital is lacking. I would love some advice please!
The D-300 at a 50% premium over the D90 is unquestionably better, but you really need to understand why before making your decision. The image quality is incrementally better on the D-300 according to dpreview.com (as linked by IndianaWes), but it's truly fractional at extreme blow-ups, and only the obsessed would feel anxious over the difference. The key difference between the two are build quality and features. The D300 is built for true professionals who'll bounce and bump their gear far more often than the typical amateur, and who'll fire-off considerably more photos over the camera's lifetime... as in hundreds of thousands of photos, not just a few. The D-300 also offers some highly advanced features most amateurs, even advanced ones, would never use.
Back in 1997 I bought the N90s, which roughly fills the same role as the current D90. It was Nikon's most advanced amateur camera that shared many parts with the F100, except it wasn't built for a real professional. It still functions flawlessly after years of heavy (albeit amateur) use. I expect my new D90 to play the same role.
Also check www.bythom.com for comparisons. Read his D90 review because at the end he recommends which Nikon DSLR to buy based on current one you are using and what your goals are. Agree with earlier post that dpreview and Ken Rockwell are also good sources for information.
If you're considering a D300, forget it. Get the D90 instead.
Check out Ken Rockwell's thoughts at http://www.kenrockwell.com/nikon/d90.htm He knows his cameras (mainly Nikon and Canon) although sometimes he TELLS you he knows his camera's a little too much but still... he gives outstanding information.
Here is a quote from his article "The Nikon D90 is a fantastic camera. It's Nikon's newest and best DX format DSLR. I prefer it to the old D300, which costs almost twice as much. That's the way it goes with digital cameras: new is almost always better, even for much less cost. The D90 has identical, or slightly better technical image quality than the D300, the exact same rear LCD, and adds several very useful ergonomic features for faster handling compared to the D300. These handling improvements will let you react faster to conditions, meaning you're more likely to get better pictures by being better prepared. If you're considering a D300, forget it. Get the D90 instead."