Dayton $1.50 cap on tweeter
Clarity PX cap on mid tweeters $8
The rest of the caps are all under $5 electrolytics. Bipolar generic types. The wire is all perhaps 18-20 gauge mill spec. All sand cast resistors.
The fact that these sound so good with these parts is a big testament to the wonderful design. They can be taken to another level easily.
When a builder is selling to hit a $3300 price point they really have no other choice in terms of parts quality. I would do the very same thing. Heck, they sound good as is. Amazing.