Don't do the trading route though. If you lose it, you lose it all. If you go hardware and lose it, then at least you have the hardware to sell back.
I've heard this quite a bit, and it's true to an extent... However, if the "bubble bursts" - do you think the market will support the thousands of 7950s and 280x's that would end up on eBay? You will get something, but it will definitely be a buyer's market.