@Heidi B.
I do think we are heading into a RE bubble, but it is more localized this time (looking at you Denver) and not at a national level when compared to the global financial crisis. Also at that time there was very little due diligence on loans applications and people were buying homes with no skin in the game. There are some worrying trends on the macro economic level, such as the slowdown in China you mentioned. For example, this has hurt the demand for commodities and the once red hot real estate markets in Western Australia, which is a source for those commodities, are starting to suffer.
One simple barometer to watch is cost of renting versus the cost of buying. As prices rise too quickly the cost of ownership becomes far higher than what it would cost to rent. At that point it may make more sense to wait, conserve your cash, and buy when prices pull back a bit. I find the topic of a current bubble very interesting and if you are interested I recently wrote a post looking at six factors indicating that we are heading into a bubble.
All the best, Nathan
https://www.biggerpockets.com/blogs/7314/47526-are-we-heading-into-a-real-estate-bubble-six-factors-to-consider