My bottom brackets are usually from Wheels MFG though I did just get a Kogel B.B. but that was more of a really good deal as I got it at a fire sale at my old shop since they are trying to liquidate stuff but I have been pretty much the only former staff helping out as well (because I was recommended and trusted not because nobody else would help). Chain I usually stick around Ultegra level I don't see a major need for DA for that same with Cassette. Pedals are XT level for added durability V.S. XTR (since I run SPD not SL or Look KEO...) Wheels are all handbuilt and in the case of my main modern 11 speed road bike with rims brakes they are White Industries hubs laced to H+Son rims (because the Hard Ano Gray look so good) and those are certainly not really consumables in that same way if I do wear out the rims and I still have the bike I will probably just re-lace the hubs because I expect them to last for quite a while.

I personally don't see a need for DA for most modern things but I think Ultegra usually has looked better in most cases (except maybe 9 speed it diverged and of course 25th anniversary stuff looked fantastic) However I am not opposed to buying it if that is your thing but most people won't see that as your riding by at least not consumable wise but if out and out weight reduction and performance are on the menu and you have the money go for it. I have bought plenty of "stupid" things for my bike because I wanted them.

I say get what you can afford and makes you happy.