If it motivates you at all, I installed an NEC 6 Pg today with an original 677 hours on it. No wear on the tubes, but I changed a number of parts in the unit due to age.
A multimillion dollar home, and the owner had sold it, only to realize his 10 year old Vidikron POS CRT projector died sometime in the last year while he wasn't using it. I tried repairing it, but had no info on it, and thus sold him the NEC so he could say the theater worked.
This was a 10+ year old system. One line doubler, no HD, and since the house was sold, he had no interest in upgrading it to HD.
Once I started aligning the projector, I found that the Svideo input of the doubler had also died, so all we used was composite through the doubler to the projector. While not quite HD quality of course, the 5th Element was still damn amazing for 15 year old technology, and the customer was so impressed, he's hiring me and the ISF guy to put a 9" set into the new home he's building, construction to complete in July 2011.
Customer said that no digital he'd seen came close to the 3D image he saw from a CRT, and I agree with him. In his really nicely set up HT room, the image sang.
So really... what's stopping you?