Good lord, up to 6k? How often do you upgrade your system? Are you a professional gamer?
Wow.
Anyway...
I recently purchased the
#1 rated case on Newegg and have been very happy with it. Lots of vents and fans for cooling, and spacious so it's easier to build (your "computer guy" will appreciate that). With all the fans (it came with 4, and I've installed 2 more, plus the CPU fan), it's also the loudest computer I've ever had, but the cool running temp is worth it to me. It's also on sale at Newegg for $35 off right now!
I'd recommend the same route for your power supply. Newegg's
#1 rated supply is 750W which should be enough for you, and it's also on sale for $60 off (plus another $10 off via mail-in rebate).
For CPU cooling, I've been very happy with my Zalman fan. I've found Zalman fans to be both affordable and effective. I did a quick search and it looks like the i7 is socket 1366.
This is the fan I've got, and while it's not made for socket 1366 it looks like they're giving away a free compatibility kit with purchase. I've been very happy with it, and you'll notice it is also one of the highest rated fans on Newegg. I'm sure there are probably newer Zalman fans made specifically for socket 1366 which might be better, so you might be better off having your computer guy look into it briefly. I can't recommend Zalman enough though.
As for the rest of the details, it's been too long since I've looked into building a computer, so I don't know what the latest and greatest technology is. Wish I could offer more advice.