There was a thread on this topic last week, I believe. Its my understanding that the VPI outside weight is designed for the 12.25" platter, and the upgade that you are asking about is a $1000 upgrade for the 12.25" platter, a new spindle bearing and the outside record weight.
The Sound Engineering Outsider is machined for a specific turntable platter/tone arm/cartridge. This is the one that sells for $495.