My setup is 2 rack PCs linked via Gigabit LAN with FX Teleport (amazing tools, very stable and powerful!).
First PC as Host (Cubase SX 3.1) with SCOPE 9DSP used in XTC mode. (M'n'M pack and other effects) + VST effects + 2 UAD.
Second PC as external Synth Rack with SCOPE 10DSP (S'n'S pack and a lot of other synths) and VSTi rack (via FX Teleport): 256 samples/delay, but I really don't care because PDC in Cubase...
It works in same way as Waves APA!!!
The 2 PCs are linked also with 4 optical cables ADAT (2x8 in & and 2x8 out): in this way I can bypass the mixer of Cubase, and I can mix all my out busses (from Cubase with all automation and FX) with SCOPE's pro Mixer into 2 mono track in VDAT.
Then I can finalize my master with Creamware's stuff like Optimaster and PysyQ.
Sometimes I add my Laptop to the LAN (as VST/i client) and I can obtain 3 linked PC, with more realtime power. But rarely, only for huge mix... with my gigabit switch I can link up to 5 pc!!!
This system is well and easy tuned, both with CD rescue image backups. I can start my work in 2-3 mins after power on of the PCs and the external hardware.
Waves APA is a good way to fight the piracy, but it's not a new idea. I think that FX Teleport is a better chioce for Scope's communuty.
- As second pc for synth, a cheap TUSL 1GHZ is powerful enought

(secondhand 250 euros)
- The PCs are controlled with a cheap KMV box. (50-80 euros)
- FX Teleport (79 euros)
That's all!
My 2 cents.