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Tubs are cheap, because they're shit (#troll) so you're not likely to find many cheap clinchers but keep an eye on ebay. I have an S80 kicking around that I scored off ebay years ago so stuff does appear. Also have a set of 404 Powertap clinchers from someone on here years ago so again, just need to keep an eye out but they don't come up much and aren't usually cost effective.
Probably better off spending time with aerolab on your position than buying stuff to be honest. Problem is, no one wants to hear that because testing is a ball ache compared to just buying new shit. :)
Tula bars are meant to be decent but lack adjustability. If you can get them to work though they should be good.
I can get all the di2 stuff cheap. So it's pretty cost effective. Also I much prefer di2. So worth the little more.
I could do with wheels, but only to get clincher, see my post. I have tri spoke tub already and raltech covers.
I saw some USE tula bars on ebay, wonder if they're the best bet. (spesh way to spendy)