+1 to what everyone says above. Priceless advice.
The D2000 allows you to shoot in sTTL and in "Auto" mode. "Auto" mode allows you to set the strobe to the aperture setting on your camera. The strobe then figures out how long the strobe needs to fire for an adequate exposure. This is especially helpful to new photographers, but it does have it's limitations. The D2000 also has an aiming lamp, which is useful, but not as good as a separate lamp that's aligned with your lens. Sometimes your strobe does not need to point perfectly at your focus point, and in those cases, the strobe-integrated focus light is less useful. The D2000 also has a 13-step manual intensity adjustment that is very useful if you shoot the strobe in manual.
I've used a Sea & Sea, and several models of the Inon line. Both companies make great strobes. The Sea & Sea's seem to have a little more light than their advertised guide numbers, which is a good thing, but I have heard about flood issues on the newer models. The Inon's seem to have a tiny bit less light than their guide numbers, but they are near bulletproof if you use the correct batteries (the Type III strobes can overheat in certain circumstances when certain batteries are in use)
Currently I own a D2000, a D2000w, and a Z240. All excellent strobes, and all bulletproof for me, even though they were all purchased used.
While I love the small size (and price) of the S2000, I would have to say, that I recommend the D2000 Type VI over everything else I have tried. It's perfect for beginners, and it will grow with you as you advance in skill and technique. The hold their value very well. I can sell every strobe I have for about what I paid for them.
That said, there are many quality strobes on the market, and as long as you invest in a quality brand, that is sufficiently powered, toy probably won't be disappointed.