Info on Jim Sinclair's angels ?

Hi folks-

I'm new to this site and also to the whole big picture you all seem to have about what's going on in the economy and more importantly in the PMs. I've hunted and pecked around the web and found, among other things Damon Vrabels' rennaisance 2.0, Chris Martensons' crash course, this site of course, and a whole bunch of others very useful stuff. I keep reading references to Jim Sinclairs' angels. Can anyone tell me a good place to get a laymans' grip on what exactly the angels are? I assume they are resistance and support levels for gold, but can't find the info in one place or on Mineset website either.

Also, I have a couple of basic questions about buying physical gold right now. I've read the predictions about 12,000-60,000 gold but, if that happens, how the heck does one know when to sell? Will there be a huge government imposed, capital gains tax on gold if it gets to that level, or will gold eventually correct way back down after the dollar is 'restructured' or a new global currency is established? Just can't get my mind around these concepts, and as with anyone that does not own an asset that is going up by leaps and bounds ( real estate and .com bubble ), I don't want to get in near the top. Guess my real question here is : what convinced all of you to go into gold and stay in?

Sorry to ramble on so much, but I have a lot of powder and would like to get on this ride.

Thanks