Case / PSU Combo - There's no better deal than the Antec 1200 / CP-850. The HAF-932 w/ Corsair HX-850 would be a performancematch but that combo is $45 more and the Antec CP-850 is significantly quieter. ($275 for both)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129043
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371024
MoBo - I see the Rampage II Extreme has been mentioned and it's a fine board designed for people who want to get all they can out of an OC. Some would argue it's overpriced but for what it can do, it's bargain. The downside to the R2E at this point is that the R3E is about to be released. It also must be mentioned that only a small part of the enthusiast community needs this level of equipment. The OC features add 4100 to this board and if you are not going to use them, well then you don't need this board.
You can either wait for the R3E or consider several alternatives. On the top end, you have the ASUS P6T7 WS Supercomputer "Ultimate Gamer". Downside...nVidia only for multiple GPU setups. OTOH, 4 x PCI-E16 means it canb do triple SLI and still have room for a dedicated PhysX card.($400)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131390
Next we have the ASUS P6X58D Premium which gives you twin PCI-E 16 lanes but then only gives you 1X in the last slot. Still, if you aren't going to have more than two GFX cards, then this also gives you SATA III and USB 3 ($310)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131614
Finally we have the ASUS P6T Deluxe V2 which is the version 2 edition of what has got to be the best selling enthusiast X58 board by a significant margin given the amount of postings. Very similar to above but w/o the III and 3 ($280)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131365
CPU - Start w/ the 920 and then look at your budget at the end. If you can afford more, don't be talked out of it. yes, the 920 can be OC'd past any more expensive CPU's stock settings but those CPU's can all be OC'd higher than the 920.($289)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115202
Memory - 3 x 2GB is all ya need. DDR1600 for it's OC ability, no need to go higher unless you looking for 5 Ghz +. Lowest CAS # you can afford, best right now is Mushkin 998692's w/ the Ascent coolers if you can find them. The sister modules (998691) w/o the co0lers are on newegg for $245
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226050
GFX - Plug ya budget into list below:
http://www.tomshardware.com/reviews/geforce-310-5970,2491.html
Here's the "winners" from THG's latest (December) GFX Roundup
Best Graphics Cards For The Money: December '09
$50 - HD 4650
$65 - HD 4670 / 9600 GSO
$85 - 9600 GT
$95 - 9600 GT / HD 4830
$110 - GTS 250 512 MB
$120 - GTS 250 1 GB
$155 - HD 5770 / GTX 260
$200 - HD 4890
$240 - 2 x GTS 250
$310 - No winner (HD 5850 Honorable Mention)
$330 - 2 x GTX 260 / 2 x HD 5770
$400 - 2 x HD 4890
$410 - No winner (HD 5870 Honorable Mention)
$465 - No winner (GTX 295 Honorable Mention)
$625 - No winner (HD 5970 Honorable Mention)
Heat Sink - For performance and ease of installation, the Prolimatech Megahalems fits both criteria. Here's what I'm putting in new builds Mega w/ IC Diamond TIM and twin Scythe PWMfans (make sure ya MoBo can handle the fan wattage). ($95 for the HS, TIM. two PWM fans and a Y cable splitter))
http://www.frozencpu.com/products/8807/cpu-pro-01/Prolimatech_Megahalems_Rev_B_Intel_CPU_Heatsink_LGA_775_1156_1366_AM2_AM2_AM3_Hot_Item.html
http://www.frozencpu.com/products/7038/thr-41/Innovation_Cooling_Diamond_7_Carat_Thermal_Compound_-_15_Grams.html?id=BZWnrfIC
http://www.frozencpu.com/products/10026/fan-639/Scythe_Slip_Stream_120mm_x_25mm_PWM_Fan_-_SY1225SL12LM-P.html?tl=g36c365s936
http://www.frozencpu.com/products/8418/cab-150/FrozenCPU_PMW_Y_Splitter_Cable.html
If that's a budget breaker, look at the Xigmnatec S1283 or one of the others here:
http://www.silentpcreview.com/Recommended_Heatsinks
http://www.frostytech.com/top5heatsinks.cfm#INTELHEATSINK
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=371&Itemid=62&limit=1&limitstart=15
Hard Drives - Check out the performance charts and pick whatever 500 GB per platter drive performs best under your usage patterns. The WD Black 2 TB is a good choice but at smaller capacities, you are limited to the Seagate 7200.12 or the Spinpoint F3. The 7200.12 excels in gaming, multimedia and pictures whereas the F3 wins at music and movie maker. See the comparisons here (copy past link in manually, link won't work in forum):
(http://www.tomshardware.com/charts/2009-3.5-desktop-hard-drive-charts/compare,1006.html?prod[2371]=on&prod[2770]=on)
Optical - Plextor Model PX-B320SA Blue Ray Reader / DVD Writer w/LS OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16827249055