I've been considering to get a 18-200mm nikkor lens, to replace my twin 18-55mm /55-200mm kit lens (I have a nikon d5000). So I was googling around for all the info I could get, however most reviews have so much technical jargon I simply can't make much sense of them all (for a newbie like me).

So here are 2 examples:

AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II

AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED

I get that both lenses are DX, which is different from the 35mm format (which is the standard from what I gathered. I also get that they both have a 3.5-5.6 maximum aperture (depending on "focal length"?). and the top one has Vibration Reduction?

whats the G on the f/3.5-5.6G, and all the other stuff?

TL;DR How do I interpret lens specs?