Well, personal experience is
First thing I bought was a Yoke ($425)
It doubles for zercher walks
Next purchase will be (I'll update on price when i find out what it is)
Sled
Log
After that its
Tires with the inner part drilled to fit the log (behold my auto knowledge!)
Farmers
Axle/Thick bar
Car Deadlift Frame
Prowler
REVERSE HYPER
Fat/Circus DBs
Stone loading platform for Yoke