I haven't seen one either. I usually use this: http://www.egameaddiction.com/neogeocd/masterlist.html to determine if the English version is much rarer than the JP version and then adjust accordingly.
These CD titles exist in English format (?? on the list):
3 Count Bout
Blue's Journey
Ninja Combat
Ninja Commando
Rally Chase
Soccer Brawl
Most English version Neo Geo CD games are very hard to find.
Gowcaizer isn't on there either. I have the ENG version.