There was a time where power supplies got a little out of control with over-optimistic ratings. $20 700 watt power supply from ValueCompInc? Sounds like a deal!
However, the market has swung back the other way
hard. Ruff, you do
not need a 900 watt power supply in a midrange gaming build. Like OMG HELL NO YOU DO NOT. Most midrange desktops, with a dual or quad core processor, 1-2 hard drives, and a solid discrete GPU will draw under 300 watts at load. A quad core processor, overclocked, running a brand new nVidia 680 GPU can draw under 350 watts (
link) running a stress test.
If you're going to go the road of dual- or tri- video card systems, or if you need
serious hard drive capacity (we're talking 10+ conventional drives), we can talk high end power supplies. If you want to run any single video card that will ever fit the PCIe standard, buy a 600 watt quality unit and you'll still be massively overbuilt.
_____________________________________
Re: your specific questions...
1) Almost certainly Pro over Ultimate. If you need the specific enterprise features of Ultimate you probably already know it.
2) Probably 6870. It's up to twice as fast depending on your resolution and the game.
3) I'd not buy a soundcard (audiophiles excepted) on a full build under $2,000 or a tower-only build under $1,500. And, you shouldn't be spending that much
![wink wink](https://www.realmsbeyond.net/forums/images/smilies/wink2.gif)
___________________________________
The most valuable lessons I've learned from building PCs for myself and others for six years:
1) Mist is right, a SSD makes
all the difference.
Nothing comes
close for bang-for-the-buck every day performance.
2) The best "future-proof" components are monitors and speakers/headphones. Ironically they're also perhaps the most under-invested-in.
3) Beyond those items there is very little reason to even try to "future proof." Selling/giving away a PC every 2-3 years and buying something new gives you more performance for less money. Migrating files in 2012 is not enough of a hassle to avoid this path.
_____________________________________
Re: ASM's point on Llano - Honestly he's right. If all you
really want to do is play Civ4 and be on the internet a cheap Llano build will be more than fine. That said, the 2500k, particularly if you have a retail MicroCenter accessible to you, is IMHO one of the all-time processor price/performance bargains.