Macs that are generally considered part of the "Power Mac PCI series":

7500/100

7200/90

7600/132

7300/200

WGS 7350/200

8500/120

Other Macs with actual PCI slots, but not generally considered to be part of the "PCI Series":

G3 DT 233

G3 MT 300

G3 B&W 350

G4 DA 433

Other Macs based on a PCI architecture (meaning no AGP graphics):

PowerBook 1400cs

PowerBook G3 Lombard