There really aren't that many that come to mind aside from the Poker 2:
The non-backlit KBT Race and KBT ONI have thick PBT caps like the Poker 2.
Ducky Premier and Yellow edition have thick PBT caps. The G2Pro and 105-key PBT sets are THIN PBT, the newer 109 key sets are THICK PBT.
I think some of the Keycool 84 and 87 (and possibly 108) boards come with PBT caps, but they're medium thickness, in between Ducky thin PBT and Poker 2 thick PBT.
Certain models of Cherry G80 and G81 had thick PBT caps, some had POM.
Noppoo Choc Mini has thick POM caps.