Critique my budget build?

Could someone look this over briefly and tell me if this build makes sense? I need help figuring out if anything here seems wrong/unnecessary. I assume a pre-built could not touch this price ($550-$600) w/ these specs?

Approximate Purchase Date: in progress


Budget Range: $600 After Rebates (not including a monitor)


System Usage from Most to Least Important: I'll use this for web, word processing, excel, playing text based sim game and maybe some browser based games, watching MLB.TV and maybe Hulu, etc.


Parts Not Required: keyboard, mouse, monitor, speakers, maybe OS (I have a Win 7 upgrade here that I can maybe use to install the operating system?)


Preferred Website(s) for Parts: newegg, microcenter or amazon


Country of Origin: USA


Parts Preferences: I've got some stuff picked out

a. CPU: Intel Core i5-2400 Sandy Bridge 3.1GHz (3.4GHz Turbo Boost) 4 x 256KB L2 Cache 6MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I52400
b. Mobo: ASUS P8H67-M EVO LGA 1155 SATA 6Gbps and USB 3.0 Supported Intel H67 DDR3 1333 Micro ATX Motherboard
c. GPU: On board
d. Hard drive: Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
e. Ram: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 Desktop Memory Model CMX8GX3M2A1333C9
f. PSU: Coolermaster eXtreme Power Plus 500 Watt ATX 12V Power Supply
g. Case: Cooler Master Elite 341 mATX Mid-Tower Case
h: Optic (CD/DVD/Blu-ray): LG Black 24X DVD+R 8X DVD+RW 16X DVD+R DL 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM SATA DVD Burner - Bulk LightScribe Support


Overclocking: No


SLI or Crossfire: No


Monitor Resolution: SAMSUNG 2333T High Glossy Black 23" 8ms Full HD WideScreen LCD Monitor 300 cd/m2 DCR 50,000:1 (CR 4,000:1)


Additional Comments: I would like my machine to be quiet as it can be without paying a ton extra to make it so. Want USB 3.0 and this MB has it.