Scored some free G4s a 933 Quicksilver, a 733 DA and a dead 1ghz MDD
Sadly, both the MDDs power supply and motherboard were toast but I got a nice copper heat sink out of it as well as the video card. The processor was a single 1ghz so I'm not sure if that'd be a downgrade or an upgrade if I stuck it in a dual 867mhz machine.
Best score was the C-vue. LCDs were'nt overly practical 25 years ago but I've wanted that one for a while.

The MDD power supplies are expensive to replace and the single 1ghz was only used in the FW800 model. A dual 867 is definitely faster except if you are booting into 9 where the second CPU isn't used by the OS and your software must be multiprocessor aware to show speed gains from multiple processors. The 1ghz single also runs on the 133mhz bus so you can't swap it into a 167mhz bus model without seriously overclocking it.

I could probably change resistors so that it'd work on a 167 bus but there doesn't seem like much point as I have friends in the Mac repair business and could likely get all the dual 1ghz I want. Dead power supplies seem to be the leading cause of death for the MDD. I have a couple of MDDs with dead power supplies so I'd hoped that this one had a good one but no such luck. I'm thinking about using a PC power supply to get one going.. Don't know if there's one that'll fit in that space but I could always run it outside the case.