The G1W and G1WH are both excellent choices and I've bought several of them (both are $55-$70, depending on where you get it). The G1W is more conspicuous in that you can look at it and, with the chrome ring around the lense, it looks like a camera. The G1WH has a slightly wider viewing angle.
I would flip a coin between the two, honestly. The one little bonus of the G1W is the little LED indicator blinks when you have the display set to off so that you know it's still recording. You can read license plates with both of them.
The only warning I have is to make sure you don't get a counterfeit one. Get from a reputable seller on Amazon Prime, where returns are easy. Make sure it saves to .mov format and not AVI (one of the ones that I purchased was a fake and I sent it back -- it was a new seller on Amazon). Another way to tell if they're real is that they can see better at night than you probably can.
You'll need a microSD card as well. I go with 32GB cards. The G1W and G1WH are fickle. Make sure you get the right kind; I think Class4/6 are recommended and that people have had issues with Class10
As for configuration, I turn off the impact sensor (with a 32GB card, you'll have enough time to pull the video before it overwrites; the impact sensor locks files and the memory will eventually fill up and it will stop recording until you erase it). I also set the "screen saver" for 3 minutes because seeing the image is distracting while driving.