I had luck finding a G4 AGP with a Sonnet Encore ST 1.8 for only 80 bucks some months ago. Because the technical and optical advantages of the QS i decided to put the Encore into a QS 733 and build the QS i could never afford in my younger days. Now with a 1.8GHz G4, 1.5GB RAM, an ATI Radeon 9800 Pro SE (256MB) genuine Mac edition (on which i installed a NOS Zalman cooler to tame the heat), a 4-port SATA PCI card, a 128GB SSD and noctua and bequiet fans, this PM runs circles around all my other G4 and is my weekly-driver for music (Reason, Sibelius), some graphical stuff (AI, ID) and retro gaming.
I hope that some day i will find either a MDD 1.42 DP or a 3rd party Dual G4 CPU upgrade card for my QS. And not for thousands of dollars…