I'd have to agree with Adams. Get an Acorn and a PBC. Or build a UDS. Or get the Vision At Costco while it is on sale. A used Egg would scare me. They come with a lifetime warranty for a reason. And the Keg is nice, but $699 seems steep. Is it the 2000 or 4000 model? The 2000 is pretty stripped down.
At the end of the day, you can cook good cue on a lot of grills. No need to spend a bunch of money, especially if you are a beginner. Start slow, find what you like, and then invest.