Case - You have a full tower there which may be a bit big in a bedroom. Would suggest an HAF 922 or equivalent DF series from Antec. If you think they'll move to twin GFX, then I'd stick w/the full tower....assuming it fits well in room w/ furniture.
PSU - the 750 is an oddball size.....you'll want an 850 watter for twin GFX cards and 650 for one GFX card.
For comparison purposes , the list below contains performance ratings (10 scale) at jonnyguru.com / prices as per newegg on 02/21/2010 and ones w/ double asterisks (**) made it onto silentpcreview.com's Editor's Choice List meaning they excelled at both electronic and acoustic performance:
850 Watters
Antec SG-850 - 10.0 ($220) **
Antec CP-850 - 10.0 ($110) **
XFX 850W Black Edition 10.0 ($185)
Corsair HX850 850W - 10.0 ($180)
Antec TruePower Quattro (TPQ-850) - 9.5 ($150)
Corsair TX850 - 9.5 ($140)
Seasonic M12D 850W - 9.5 (NLA) **
NorthQ Giant Connector 850W - 9.5 (NFS)
Etasis ET850 - 9.5 (NLA)
Silverstone Zeus ST85ZF - 9.5 (NLA)
Enermax Revolution 85+ 850W - 9.0 ($250)
Thrmaltake Toughpower XT 850W - 8.5 ($216)
OCZ Z Series 850W - 8.5 ($200)
650 Watters
Antec Signature 650W (10.0) OOS **
Seasonic X-650 650W (10.0) $160 **
Silverstone Olympia OP650 (10.0) NFS
Thermaltake Toughpower QFan 650W (9.5) NLA
Antec Earthwatts EA650 650W (9.0) $75
NFS - Not For Sale / NLA = No Longer Available / OOS - Out of Stock
MoBo - Asus' latest and greatest entry in the 1156 arena is the Sabertooth, cheaper and better option IMO than the Maximus. Newegg's been having trouble hanging onto them though
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Was $149 at Amazon but now $184.
But, as others have said, beware of buyer's remorse w/ Sandy Bridge arriving in early January .... but then .... maybe ya should wait until others suffer thru the "bleeding edge" and wait for mature BIOS's and till "revision A" hardware has been sold off and ya can get the "new and improved" models.....but then the next big thing will be on the horizon.
CPU Cooler - Drop that choice for one of the top 3 here
http://benchmarkreviews.com/index.php?option=com_conten...
TIM - Add a TIM, here's a list but I'd avoid AS5 and it's 200 hour cure time.
http://benchmarkreviews.com/index.php?option=com_conten...
RAM - Can't see buying CAS 9 when CAS 7 and 8 often available at same price. Also you have a CPU cooler that begs a 50% OC but your RAM only rated for 25% OC (1333)
This CAS 9 DDR3-1600 is only $39 after MIR
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CAS 8 at $64
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CAS 7 at $64
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CAS 6 at $89
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
GFX Card - Unless power supply size becomes an issue ... I'd take the GTX 470
http://www.tomshardware.com/reviews/gaming-graphics-car...
Quote:
"We should also mention that the GeForce GTX 470 can use nearly twice the power of the Radeon HD 6850 under load, which might be a concern for folks without a lot of power supply overhead. On the other hand, the GeForce GTX 470 probably has more available overclocking overhead than the Radeon HD 6870, since AMD's entry is clocked quite high to begin with."
$219 after MIR
http://www.newegg.com/Product/Product.aspx?Item=N82E168...