RE: New computer has been purchased - specs, rationale, and thanks
Antec and Cooler Master make some great cases you can't go wrong with either.
That's a classic power supply, solid and will last a long time. I think it's always good to a little headroom with power. You don't want to just barely make your power requirements. Plus if you upgrade hardware that has more power requirements, your headroom will help spare you from upgrading to another power supply in the future.
About the liquid cooling, waste is probably one of the most misused words in the English language. You didn't waste money. You used it. If you didn't buy something with that money and had it stacked up in a vault until you died, then it would have went to waste. Money not spent is money wasted, you can't take money to the grave. I have no idea what this cooling system is but you shouldn't feel bad about investment.
I've heard the asus forums are on fire right now about their rampage board having problems. You made a good move to avoid a potential problem. Even though you're covered with warranty service, the easiest way to solve a problem is not to have a problem.
Warranty is always great. I would not get sucked into a 5 year warranty or longer though. After 5 years computer parts need replacing anyways because they become obsolete so quickly. If something goes after 5 years, you got it's "lifetime" out of the product, and it maybe time for a whole new build/rebuild.
Grats on your system! Enjoy it.