Ramps are expensive, and am pretty sure the left side ramp isn't reproduced yet.
Having Mike Chestnut re-plate the Wireforms in high-polished brass (gold look) really will make the game pop. That'll set you back another hundred plus shipping.
Add a Cliffy protector on the hole. $25
If the flippers haven't been rebuilt in a while... plan to rebuild them: $50 + your time.
The little things do start to add up, and when all's don't you don't want that to be on top of paying a top price for this game. There are plenty examples of this title out there.