I'm in the same boat (except for the 40 - I have 36). I've been looking everywhere. My Akronts are toast. I looked at Buchanan's also and got a quote on s/s spokes/nipples. Their prices were about level with all the other places I haunt...Vintage Iron, East Coast Maico, DC plastics, AMS, rage racing - to name a few. Bucannan makes the sun rims and I have one of those that's also toast. You should email them and see if they can get the excels you want. You never know what they can do. I'll probably end up with excels and B's s/s spokes/nipples. I bead blasted the hubs and will probably leave them bare. I'm doing the build which saves about 400 (2 sets).
If you find something better post it!