PSU / Case - Since you said twin GFX is in your future and my guess is you are likely to overclock, a full tower case and hi quality PSU is in order. Following the start you've given, I'd say move to an HAF 932 w/ a Corsair 850HX ($340 for both). If you are willing to consider alternatives, the Antec 1200 / CP-850 easily matches the quality and performance of the other combo but gives you filters fr the air inlets on the case and a quieter PSU, all while saving you almost $100 ($244 for both).
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.335367
MoBo / CPU - Good combo
HSF / TIM - Don't find this cooler very impressive. Suggest picking from the top 3 04 models 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
And for the TIM, same deal with the top 3 or 4 here:
http://www.hwreviewlabs.com/index.php?option=com_content&view=article&id=64%3Amega-44-thermal-paste-round-up&catid=32%3Around-ups&Itemid=47&limitstart=3
http://www.xbitlabs.com/articles/coolers/display/thermal-interface-roundup_10.html#sect1
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=138&Itemid=1&limit=1&limitstart=3
Right now I am putting the Prolimatech Magahalems (Rev B w/ 2 fan clips) and the IC Diamond 7 Karat TIM on my builds as they both offer a combination of top notch performance and extremely easy installation.
GFX - Look at the latest GFX Card roundup on THG's home pages....the recommendations across the various price ranges are sound, except IMO the 5770.
HD's - 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)
NOTE: Throughout the year I will advise prospective builders that if they are gonna sit and wait till "the next big thing", they will never pull the trigger and buy anything. February is the month where I set that advice aside:
1. Intel typically drops CPU prices at end of February.
2. Intel introduces new CPU's typically in Feb / march (March 16 we see 1st hexacore)
3. All the cool stuff shown at CES in January hits store shelves in mid March
4. Antec / Thermaltake and others have new PSU's and case lines coming out in March
5. New Vertex2 SSD's supposed to drop in March
6. Fermi scheduled for mid march release.
7. New MoBos w/ new feature sets arrive with new Intel CPU's
8. Even if none of the new stuff tickles ya fancy, it almost invariably pushes older products prices down.