Hey, I'm doing a semi-weight-weenie build, too, and I just bought a used SLR off eBay. I'm eagerly awaiting delivery, but I think that I will eventually spring for this:

http://www.glorycycles.com/fiansawibrca.html

I like all of Fizik's saddles, so I'm counting on them to deliver!

I, too, want to know what's WW about your build. My most WW components are:

Langster Comp Frame
Easton EC90 SLX fork
Eeaston EC90 flatbar (taped)
American Classic track wheelset
SLR
KCNCI Ti Seatpost

I'm having a lot of trouble deciding on a crankset. What're you going with?