See, if the G5 could do Mac OS 9, then I'd have all my bases covered, but it can't, so I'd rather have a faster G4 MDD than mess around with more PMG5s than i already have. But water cooling is fiddly and I don't trust myself with it.
But when overclocking a system like this, my question isn't "what's the gigahertz?" It's more a matter of "how much more performance can I get out of this, and will it be stable?"

💻 PowerBook G4 Hi-res DLSD 17' OC to 189MHz bus and 1,89GHz CPU 💻

I'm assuming it's this beast, which wouldn't surprise me in the slightest.