- Better AFD90 would be more suitable for a start.
The main advantages from D300/s are mainly from
- more controls and speed
- more sturdy body ( and heavier )
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- More AF points
- Dual memory card slots
- Better VF
...
Plus a lot more.
What is most suitable to start with is up to each one of us and noone can really tell unless you know the person who is planing to buy a camera.