Wheels are a good topic - still researching. I've set up a summary spreadsheet if you'd like me to send it to you.
I like the idea of building a set too - I've looked mostly at DT 240S hubs but there are others out there like White and Chris King. As far as rims the Pacenti SL25 looks good as well as some from WTB and Stans
The Carbon Warbird comes w/DT Swiss R24s but they are a little heavy at around 1775. The also have R23s at 1655 but pricier. My mountain bike came with a pair of Easton EA70 XCTs and they have been bullet proof after almost 2 yrs of very hard riding. Great wheels and UST tubeless. But they are a little heavy too at 1755. As far as light and reasonably inexpensive wheels, the ones I've looked at are American Classic and Stans. American Classic has the Mtb Race 29 and the Argent Road Tubeless Disc. Stans has the Cross - both Pro and Team. These are all w/alloy rims and, of course, there are many carbon options out there. Some may require a cassette hub replacement to convert from mtn 10 (or 11) to road 11.
So I just picked up a set of EA70s on eBay for a pretty good price that I plan to use as a second set for the Warbird - the ones with the 40c+ tires. Then I plan to use the stock wheels w/the stock tires for road and light mixed use until I wear them out. After that will probably put on some 28s also primarily for road and some light mixed use. Also found a Spline One XR 1501 front wheel at a great price so I got that too - 710g. All of those wheels will work on my mtn bike too.
I agree with you re the price of Di2 so not sure if it's going to happen or not. At the same time, I'm getting a very good price on the Warbird and I think the SRAM levers, derailleurs and brakes could bring about $500 on the used market. If so I would have a full carbon, thru axle, Di2, and hydraulic brakes for <$4k. That would be pretty close to current state of the art I would think. Only upgrades would be some Dura-Ace and carbon wheels.
Hope that helps. Not much else to do while my patience is being tested
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