I'm a bit lost: you already had a pro9000, now you have two, but only one working print head between them?
I guess that might be useful if the first printer dies for a reason other than the print head, but in that case you could simply swap the head into the thrift-shop printer and carry on.
I still have a 9000s, it works as well as ever, but for B&W it really sucks, bad magenta cast... if you are just doing colour you aren't manic about colour management, it's a good printer for $11.
If you want to do B&W, you can do much better