What are the different Kindle versions available?

I hope I don’t get shot down for asking a question I should be able to google the answer for, but for some reason I’m having trouble navigating the amazon website. Can someone tell me what different versions are available of the Kindle?

As I understand it there is:
Kindle Version 1 (i.e. the slightly slightly older model)
The new Kindle (with no special name)
And the Kindle DX (just has a bigger screen?)

Can someone help me out? :-P

I’m keen to get my hands on one of these, and I’m not convinced I should need to buy a new one I think the old version would be fine. I’ve never had an e-reader before, so any kindle owners who can pitch in their 2 cents that’d be great :)