Especially since breeding has been scaled but the 300 wall remains, the construction time reduction would probably be wise. I think @Tinsir did an analysis on this a while back.
Also, it looks like your totals are for completion of the entire research tier, not just going straight to the construction time reduction (‘Diamond Tools’ in Gold) - although that’s an assumption based on the higher than I expected token requirement you stated.
That said - I have only completed through green, so I’m definitely not advocating it strongly, I just understand the rationale behind doing SOME of the higher research.
I definitely agree with you here though - to each, their own. Gotta love opportunity cost