You may be comparing the price for a 76cx vs a 60csx. All the prices I've seen show the 76 version of either at $50 more than the 60. I, personally, have a 60cs now and plan to get a 60csx. With a 1gb micro SD I'll be in heaven.
FYI: I contacted Garmin about the max size of SD cards the unit will support. Here is the reply:
Personally, I cannot understand why they do not support at least up to 2GB (FAT) filesystem. In this day in age, it seems very shortsighted. Well at least we now have removable media.