I think the d7000 will suit you more. It offers a feature set very close to the d300s. And its sensor is newer with newer technology.
Both d300s and d7000 should be of the same sensor size. Even if there is a difference, which I doubt, it is negligible.
D300s offers a feature set stronger for the working professional photographer, in handling and speed of operation. You sound like a hobbyist and the d7k would be more than enough for you.
Remember, digital bodies will come and go. Lenses last a lot longer. Make your choice carefully to maximize the value of your budget.
Both d300s and d7000 should be of the same sensor size. Even if there is a difference, which I doubt, it is negligible.
D300s offers a feature set stronger for the working professional photographer, in handling and speed of operation. You sound like a hobbyist and the d7k would be more than enough for you.
Remember, digital bodies will come and go. Lenses last a lot longer. Make your choice carefully to maximize the value of your budget.