Current Thoughts:
I'm pretty sure I'd like:
CPU: Intel Core i5-3570K
GPU: Previously purchased 5670 (don't think it will affect the PSU much, will it?)
RAM: 8GB 1600Mhz DDR3 (same one as suggested)
PSU: Corsair 600 Watt (as suggested)
Not so sure about:
Motherboard: GA-Z77-DS3H (is this any good?)
Case: can I use the Corsair Obsidian Series Black 550D or a similar quiet case?... or should i just use the Corsair Carbide 300R?
Storage: I think 64GB of SSD would be fine, but the suggested it at least 120GB. I would only need 500GB of 7200rpm for other storage.
CPU cooler: Do I seriously need that expesnive of a CPU cooler? (the suggested is a Corsair H60 Liquid Cooler)
WiFi Card - I'm fine with the suggested one, but would a card or a USB dongle be better? I also want bluetooth for Apple's Wireless Accessories.
What do you think?
Windows updates are a nightmare, OSX updates are probably once every 4 months or so. Usually their not a hassle, but occasionally their can be small problems, usually all you have to do is install the update off Apple's website instead of using the "software update feature." Although you can use this feature for anything else, as long as its not a system update.
Now to answer your questions.
I have a DS3H, and I couldn't be happier, I have had basically had ZERO problems. I dual boot windows with it also. I can't think of a single major problem I've had.
I personally have the corsair Carbide 300R and am very happy with it, it has plenty of room for anything you want to add. Not to mention it looks amazing. The case fans are audible though, not as quiet as I'd like, but still pretty quiet.
No, dont get the exspensive liquid cooler, I dont know why they put that in the buyers guide, it's completely overkill. You'll be fine on the stock cooler as long as your not overclocking. You could also get a Hyper 212 cooler for like $25, using this I was able to overclock to 4.2GHZ on stock voltage (the DS3H does not have v-core adjustments).'
I would go with the suggested wifi card, it is great, zero problems with it, USB ones can break sleep.
Use the recommended bluetooth of the buyers guide, I have it, and it works fine.
BTW you dont need a 600 wat PSU you could easily downgrade to a corsair 430 or 500 watt one.