Thanks, guys. I did a bit of work on my seatpost. I removed the "Zertz" insert (16 gr), and cut the length down. New weight = 206gr (down 34 from stock). (I updated my list above)
Still not super-light. I do need a 27.2 x 300 with an offset of 20 mm. The ones I'm finding that meet that description are coming in at 180-195 grams.
drainyoo , for cables, I decided to stick with the Jagwire Road Pro complete kit. I've learned a lot about the link-type sets from this site, and I like the idea, but couldn't justify the cost. If I were doing a full-out weenie-bike, I'd definitely use links.
I have ordered a pair of the Continental Supersonic tubes. $34 to save 80 grams in rotational-weight is a really good deal.
I wish I had known about that 39gram pump. I just bought an 80 gram one. I conceded the weight to have a flexible line on the pump-head. I think I could have been convinced to give up that feature, to get 39 grams (at nearly half the price of the one I bought).
I also found that if I remove the stickers from the Vuelta Corsa Lite wheels, it shaves off almost 8 grams per wheel.
Right now, the built-bike-mock-up is 16.6 lbs, using my old cables and bar tape. With the new tubes, and the new cables... we're going under 7.5 kg.
I'm now officially bit by the bug. I can see sub-16 lbs is possible, without throwing an insane amount of $ at it. Still, all the weight-savings I'm looking at are over $1 per gram saved.
As for going to Force/Red... I've looked into that. The cost-per-gram-saved is outrageous**. I will take that route only if parts need to be replaced (or I get a good deal on shifters, because the better quality can help justify the price).
: on this 10 pound bike
, the total for shifters/derailleurs is only 106 grams lighter than my bottom-of-the-line