Digital BW, The Print

Had almost made up my mind to purchase the 7600, and now the 4000 
shows up. Very tempting, as I only need 16 X 20 output. However I am 
looking for others ideas as why or why not go with the 7600. One 
thing I found very different in the specifications was that the 4000 
printhead life is 8.4 billion shots per nozzle. The 7600 printhead 
life is 28 billion shots per nozzle. While I realize that numbers in 
the billions are extremly vast who knows how many times a nozzle 
fires in the course of say a 16 x 20 print. The difference, at any 
rate, represents a very much shorter nozzle life compaired to the 
7600. 

Also I have heard it both ways, "there is a stand available for the 
4000 and their is not a stand available". Anyone know for sure.