If you are truly going to have someone build it for you, use a custom builder rather than a "puter mill". I don't know that much has improved since Dell bought alienware but I imagine the
http://blog.alienwaresucks.com site is still around.
For MoBo, I'd recommend the Asus Rampage II Extreme if you want to go all out, the P6T if you wanna calm down a bit.
Th 920 is the sweet spot right now price / performance wise and should remain so till February. If money isn't an issue however than there a lot to be said for faster rated CPU's. After all there is a reason Intel labels a chip a 920 instead of something higher.
I'm kinda stuck on the Prolimatech Megahalems as a HSF at th moment. Seems to outperform the competition on 90% of the reviews and general consensus is that it has the easiest mounting arrangement.
For RAM, DDR3 1600 is about the fastest that seems to make sense at the moment. Aything more than 6 GB will be wasted on anything ou are likely to run. Dial it in on newegg (3 x 2GB, DDR 1600, etc and soon you will be left with less than 2 dozen choices.....go down the lsit and find the lowest timings you can afford. Last I looked, Mushkin Redline was holding the lead on timings.
I agree with you that both the 295 GTX and 2 x 5850's are viable choices. The twin 5850's will win for raw performance easily. For me DX11, isn't really a big deal as, with 11 machines in the house, not one of them has DX10 and no one is complaining. NVidiahink is significant and others see no value as it doesn't increase fps.
Personally, I like to buy hi end MoBos.....I find the longevity offered by the superior components , especially in the realm of power management to be worth the investment. To my mind, the $300+ investment pays off in the long run. Many won't agree.
For PSU and Case buy what you need. I recommend the Antec 1200 / Signature series combo. To find ya size, use this:
http://www.antec.outervision.com/
use 85% CPU utilization, 90 % load and 25% capacitor aging in the drop downs. Depending on how efficient you wanna be and how much "cushion" ya want, multiple the answer by a peak to average power ratio you are comfy with. I use 1.5
Look at the THG HD Performance charts to see who's at the top of the charts on the day you buy....the top dogs change frequently. Make sure to check the temperature and sound level charts. And keep in mind that afst 2 TB drive won't translate necessarily to a fast 1 TB drive from the same vendor / model line.
On Board NIC and sound, especially on the R2E is fine.
My son is doing a build right now and has it posted here. It's the 1st one he is doing w/o my help.
http://www.tomshardware.com/forum/ [...] oney-spend
His budget is a little higher but he has new KB, mouse, etc in there which is driving up the price.