That custom made PPU sounds really promising. Now the question remains if the price will be really reasonable. 
I'm sure it'll be more reasonable than hunting the endangered species that is the NES arcade PPU

So, actual pickups time!
Tried to fit it all into one pic, but had to use flash.
From retro game store:GB - Motocross Maniacs $1
GB - F1 Race $1
NES - Cobra Command
$1 Buy 2 get 1 free
NES - Star Force $4
SNES - Thunder Spirits $5
SNES - Super Godzilla
$4 Buy 2 get 1 free
SNES - X-Men Mutant Apocalypse $8
From Goodwill:Original XBox system -
$5!The XBox came with composite video cables and one S controller (in rough shape), but no power cord... but it uses a very standard power cord so I was quickly able to find one and hook it up to test it. Works fine. Never had the original XBox, and I'm debating whether to flip it or keep it and softmod it.