Oh, man... Where do I start?
PowerBook 5300c: The first Macintosh I owned, my late-college laptop (replaced a monochrome 386 laptop.) Also the first mobile PowerPC.
PowerBook Duo 2300c: Just the awesomeness of a Duo, but with a PowerPC!
PowerBook G4 (Aluminum, 12", 867 MHz

The first Mac I ever bought brand new, bought soon after the Aluminum line came out in 2003.
Power Mac G4 Cube: The first Ive "design over function" Mac, just got a used one.
iMac G4: The next "design over function" Mac, at least a bit more usable for its target market, although equally "wickedly more expensive than it should have been" than the Cube. Got one of these a couple years ago - the last model that can boot OS 9.
Power Mac G5 quad-2.5: The ultimate PowerPC system. Don't have one of these yet.
You did say "PPC Mac", so the next one doesn't fully qualify, but it
is my favorite PowerPC system I own.
IBM ThinkPad Power Series 820. Yes, a PowerPC ThinkPad. Originally planned to run OS/2, IBM never released a fully functional PPC version of OS/2; so most of these ran either Windows NT or AIX. (There was also supposed to be a Solaris port, but that seemingly never saw the light of day.) Equipment-wise, it is functionally the same as a PowerBook 5300c (PowerPC 603e at 100 MHz, 12" 640x480 screen, etc.) Mine has no battery, no floppy drive, and a dead CD-ROM drive. It has Windows NT 4.0 on it, and I do have an Ethernet adapter for it, so it will browse the web on IE 5.