There is a very big problem with using chinese vendors.  Once a company 
has regular orders for a particular board with parts in it, the fun 
begins.  There are 'buyers' there who make thier money by finding your 
parts for just a little bit cheaper.  Lets say theres a .1uF cap in your 
board.   These buyers will go out and find a better deal, they might 
save 5 cents on a bag of 1000, for a part that is marginally more 
cheaply made.  They will do this continuously.  Until they are buying 
caps so cheap that your units will fail.  You are going to say 'omg I 
never said to use this cap' and then you are going to realize that the 
entire board is filled with components so cheap that they are always on 
the verge of not working.  Customers will start getting pissed off and 
your return rate will go thru the roof.  All so a guy in china can 
pocket $0.05.  This is china official operating procedure.
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