Ivy Bridge i7 (or better family)
HD 7970 (or equivalent GTX) + HD6950
2-4TB hard drive
5760x1080 (triple 1080p)
My current build:
Sandy Bridge i5
1TB hard drive
can play essentially any game I throw at it on maximum settings, even the most recent ones, so I'll probably only update the graphics card in a year's time (and even then, I will keep the old one if it's still working and use it as a secondary card for GPGPU - I mean, if there's enough room in my case ) I've already saved up for the extra terabyte and second monitor for christmas. As for the internet, it is what it is over here - can't change that.
All that to say, I don't find games are really pushing the limits of hardware right now. Even an 6-year-old PC with its old 8800GT can comfortably play most recent releases on at least medium quality, so I don't feel the need to upgrade that much. But I feel game developers are neglecting the "gameplay" aspect of games, which makes technological advances rather moot (apart from the "wow, that looks lifelike" first impressions).
Components only draw what they need from the PSU, and you want to be on the "too much" side than the "not enough" one. Though obviously getting a 3kW PSU is overkill, but even good-quality PSU's typically cannot sustain the advertised power, so you want to keep a bit of leeway. My build is only using 65% of my PSU's total capacity, but I'd rather that than cheapening out on the PSU and using 95% of its capacity, where plugging in my external hard drive would risk overloading everything.
That's what I thought. 1000w PSUs for reasonable high end PCs? That's a disaster.