Nothing is overkill for 1440p@144fps. Just depends on how good your price/performance level is.
Instead go for the Corsair ML case fans. Those are the better ones.
32GB RAM, for what? Future proofing or aesthetics? For now, don't need more than 16GB at all for gaming and productivity.
Could save ~35 dollars and get the Hitachi Ultrastar 7200rpm 2TB HDD, if 3TB isn't necessary.
I'd recommend reference design graphics cards (blower) for SLI setups. They offer improved air circulation compared to custom AIB's.
Motherboard choice etc. is all your chose.
Example: Parts with same grade performance for a cheaper price.