Well, holding your breath would be inadvisable anyway. Everything you write indicates that you're actively looking for reasons to stay away from Mac OS X, so my guess is you don't keep up with what's new and fresh, both in the app store and out of it.
To be honest, I'd look at putting a fast single core chip in that Quicksilver, or grabbing an MDD that can boot system 9.2.2 and pop the fastest processors you can find in there, if you're just looking for the fastest system 9 computer you can get. Of course, this issue has been discussed on the forum, some suggestions are here: viewtopic.php?p=173984#p173984
Some more QS/MDD discussion is here: viewtopic.php?f=13&t=14853
There's also this: viewtopic.php?f=13&t=11099
The main thing I'd probably add to any of those is that a SATA controller and a good SSD should make Mac OS 9 fly right along.
To be honest, I'd look at putting a fast single core chip in that Quicksilver, or grabbing an MDD that can boot system 9.2.2 and pop the fastest processors you can find in there, if you're just looking for the fastest system 9 computer you can get. Of course, this issue has been discussed on the forum, some suggestions are here: viewtopic.php?p=173984#p173984
Some more QS/MDD discussion is here: viewtopic.php?f=13&t=14853
There's also this: viewtopic.php?f=13&t=11099
The main thing I'd probably add to any of those is that a SATA controller and a good SSD should make Mac OS 9 fly right along.