I'm creating a thread to talk about these:
I've been very pleased with my Wilwood adjustable proportioning valve and these seem like a logical next step. They are $400 at Summit Racing and elsewhere. They are a bolt on replacement for LX-i's and SE-i's or any other car where you have done an LX-i front brake conversion. The only catch is that you'll need 15" rims minimum to clear them.
I called Wilwood today and spoke to a normal guy in an office in California. He spoke American English (ie: he wasn't in some foreign call center), was very knowledgeable and very nice. Wilwood is still making these calipers for our cars. More importantly, they are still making pads and spare parts so you can service them. They don't have any plans to stop making the parts and are still making parts for brakes they made 30 years ago. My guess is that even if they stopped making the parts, they would still get you what you needed if you belly-ached loud enough. Better yet, the pads are made on a standardized backing plate (7812), so you can buy pads from anyone who offers that backing plate in a compound you like. I admit that I haven't yet proved that other pads are available though.
The kit is fairly expensive and replacement pads are between $50-60. That's pricey when you figure you can get pads for as little as $6 on Rock Auto. Nevertheless, these won't perform like $6 pads and having brakes you can service yourself instead of relying on the dwindling stock of remans at the parts store is a comforting notion.
They don't offer rear calipers, sadly, so I'll have to stock up on remans before they disappear entirely.
Anyway, these might be a good option if you're in the market for good calipers, but don't want to go to the trouble of a big brake swap or anything.