It's official, I'm now a Borg Warner S366 owner.
Here is the link:
http://www.diesel-plus.com/dd_turbo.cfm?npid=9784
Basically, it's a little larger than my old T78, and will perform better. This is actually on back order and will be hard to get until May, but Mike at Southeast Power Systems (Diesel-Plus online) was able to get me hooked up and its on its way. Great customer service, and great prices. Every place else I tried just said it was on back order from BW and they wouldn't be able to get it until May. But Southeast Power Systems figured out how to get one to me quickly.
It's a 66.1mm compressor, with a T4 twin scroll housing, .91 A/R. I would have liked a little bit bigger A/R, but its not really available yet from BW. I've heard the 1.0 and 1.10 will be coming out in a few months. If I need to, I'll upgrade later on.
The T4 inlet configuration looks slightly different than my T78, so I'm not sure if I'll have to modify the exhaust manifold at all. I'm hoping the new housing doesn't touch the LIM.