D3000 isn't that good? D3000 is similar to D60 D40x, which are all using the sensor and image processors of the D80 and D200.
Usually the limiting factor is not the equipment. It is the skill level of the photographer. Only when you are at a certain skill level will you have a real need or appreciation for some of the more advanced features. In the meantime, the camera that is the most available to you for you to start shooting, will be the right camera for you. Seriously, once you get into DSLR level, even the beginner ones are already very good and capable.
Following are pics taken with a D40x, which has pretty much the same internals as the D3000, without the sensor cleaning or the 11pt AF. All taken with the 18-55 ED2 non-VR kit lens (except for the 2nd one, taken with Tamron 17-50/2.8)