Mac Pro 1,1s are under $200.
As much as I love my PPC Macs(I have over 70 of them), a 1,1 is infinitely more useable now. With a new video card and a small amount of work, they will run El Capitan.
I have a(personally owned) one that I use at work. I put an 8800GT in it, along with 16gb of RAM, a pair of quad core processors, and an SSD. I have it set to triple boot Tiger, Snow Leopard, and Mavericks although Mavericks is the main OS on it. It looks great on my desk(especially with a pair of 23" aluminum cinema displays), works perfectly, and is quite fast.
As much as I love my PPC Macs(I have over 70 of them), a 1,1 is infinitely more useable now. With a new video card and a small amount of work, they will run El Capitan.
I have a(personally owned) one that I use at work. I put an 8800GT in it, along with 16gb of RAM, a pair of quad core processors, and an SSD. I have it set to triple boot Tiger, Snow Leopard, and Mavericks although Mavericks is the main OS on it. It looks great on my desk(especially with a pair of 23" aluminum cinema displays), works perfectly, and is quite fast.