The best one on your list is the dedicated AC line. But even then only if its DIY (otherwise, electrical, too expensive, poor value) and you're the homeowner AND you'll be there a while.
Otherwise you want to look for things that will:
1. Be permanent. No obsolescence. Never wear out.
2. Be used your whole life regardless of equipment upgrades.
3. Actually be appreciated more and more as time goes by.
Everything on your list is a fail by these outstanding criteria.
What does pass the test:
1. Pay down interest bearing debt.
2. Synergistic Research ECT and HFT.
There's a reason they're in that order. Don't be a slave to debt.
Otherwise you want to look for things that will:
1. Be permanent. No obsolescence. Never wear out.
2. Be used your whole life regardless of equipment upgrades.
3. Actually be appreciated more and more as time goes by.
Everything on your list is a fail by these outstanding criteria.
What does pass the test:
1. Pay down interest bearing debt.
2. Synergistic Research ECT and HFT.
There's a reason they're in that order. Don't be a slave to debt.