Rosewill wouldn't be on any list I'd make for any component. DFD-85 / HAF-X / Level 10 GT top my list
MoBo is last generation (GEN3 is here).... not an issue for most peeps. Here's the latest and greatest (on sale Monday)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131790
Cooler - Hyper 212 is a great budget cooler .... but a budget cooler doesn't belong in a build w/ twin 580s which I see you must be anticipating given the 950 watt PSU. For top performance and quiet operation, I like the Silver Arrow
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=674&Itemid=62&limit=1&limitstart=4
RAM - I'd take the Vengeance over the Dominators
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233199
HD - I'd still get the SATA III HD. Yes, we all know that no mechanical drive can pull data off the platters at even SATA II speeds but what many forget is that a lot of the stuff that gets sent back and forth goes to / from those bug 64 MB big caches and they DO benefit from SATA III speeds. If the budget can handle, I like the Barracuda XT
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=708&Itemid=60&limit=1&limitstart=10
SSD - THG has a new chart
http://www.tomshardware.com/reviews/ssd-nand-reliability,3021-6.html
TIM - Shin Etsu tops the charts for thermal transference but doesn't have the curing issues that AS5 has. Here's the top 5 results of an 80-way test:
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=150&Itemid=62&limit=1&limitstart=12
Tuniq TX-3 (0) Aluminum Oxide Moderate 37.65°C A+
Gelid GC-Extreme (0) Aluminum Oxide Low / Thin 37.65°C A+
Thermaltake Grease A2150 (4) Polysynthetic Silver Low / Thin 37.65°C A+
Arctic Silver 5 Polysynthetic Thermal Compound (4) Polysynthetic Silver Low / Thin 37.55°C A+
Shin-Etsu MicroSi G751 (0) Aluminum Oxide Moderate 37.55°C A+
(0) No Curing Time or Special Application Suggested
(4) Arctic Silver 5 Application Instructions (requires up to 200-hours recommended curing time)
The single 580 will get ya 616 fps (Guru3D game test suite) for $500 .... I assume with the 950 watt PSU, the plan is to get a 2nd one .... but we're at the end of the GFX card cycle w/ new cards coming out for XMas .... will you be able to get one when ya figure its time ? Consider twin 560 Tis (900Mhz) which will get ya 40% more performance today (862 fps) for between $410 and $460 depending on model.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100006519&IsNodeId=1&Description=560%20900MHz&bop=And&Order=PRICE&PageSize=20