#4. "RE: 18-105 mm f/3.5-5.6G lens for a D5000, worth it?" In response to In response to 0
The choices can be overwhelming, but fortunately Nikon has done a lot of the thinking for you, and put together some excellent SLR+lens kits. What comes in the box is really an excellent starter kit.
The 18-55 & 18-105 have very similar built & optical quality. Both are entry-level but very good lenses. The 18-105 has more zoom range, and for a single lens I'd prefer that, but a better option would be to find a 2-lens kit which includes the 18-55 + 55-200.
Regarding an eventual switch to FX, my advise is stop thinking about that, get a camera, and start shooting! If and when it comes time for you to buy an $8000 pro camera body, believe me you won't be at all worried about the $100 kit lens you won't want to use on it.
If this is your first SLR, then you have a long road to learn to get the most of out a beginner's kit, and by then you'll know where you want to specialize and that will instruct you what special lenses you'll want to buy.