Sounds like a pretty complete list... but the cost of the Hotchkis stuff seems really high! I guess the hollow bar has an advantage.. but for under $500 I got front and rear bars, mounts and endlinks....
Also, be carefull with lateral links... most have pillowball bushings, which are illegal in STX, since you can't replace any bushings with metal.
I don't know the Hotchkis links in detail, but I've yet to see adjustable links w/o pillowballs.
You shouldn't need front camber bolts, the car's already got some that are good enough to get plenty of camber for the street, and the camber plates that tend to come with coil-overs will give you more than enough race-day camber.
You should be fine w/ just reflashing the stock ECU, no need to drop $500+ on a second one. Go to S-Squared once they get their dyno for tuninng.... it's close and you can get your suspension done there too. Or hustle w/ your engine mods and follow me down to ESX next weekend...
Oh, and I'd guess the difference between expensive and cheap STBs is just how nice they look. After all, they're just bars. I think Cusco makes one that tri-angulates in the trunk, but I think it's illegal in STX because the rules only allow for ataching strut top to strut top...