The parts you listed are about $150-$67 more expensive than this:
You can get this setup for $1667 at Best Buy in
www.bestbuy.com (honestly, you don't need 8GB of RAM... for whatever you're doing, 4GB is plenty)
1 x Intel Core 2 Quad Q9550, LGA 1366, BOX,C3
1 x Samsung DVD Writer, DVD±RW, 24x DVD±R ,8x DL , 40x CD-R
1 x Gigabyte GZ-X1, midi tower, no PSU, SILVER!!, USB, Fire wire
1 x Dell UltraSharp 22, black, full HD, LCD, DFC 70000:1, new !
1 x MSI 870-C45, AMD 770 + SB710, S. AM3, 6xSATA 3 RAID, DDR3 800/10
1 x DDR3 4GB (2x2GB) Kingmax, 1333MHz, FLFE
1 x CORSAIR 430W Power Supply, CX Series CMPSU-430CXV2EU, 12cm fan
1 x Microsoft Windows Home Premium 7, 64bit, English 1pk, DSP, DVD
1 x Keyboard + Logitech Mouse, Xbox, US layout
1 x Logitech Desktop Speakers, 2 satellites, black, 2W
1 x MSI R6770, 1GB DDR5 128 bits, Dual-Link DVI+HDMI+D-Sub
1 x HDD SAMSUNG 500GB 7200rpm 16MB cache Serial ATA II-300, F3
$1711
So why is this build better?
You're getting a decent motherboard instead of some bottom-tier junk—it's not high-end, but it beats that cheap AsRock board. You get 4GB of RAM which you won't even fully max out right now anyway, unlike having unnecessary 8GB sitting there. Better monitor, a significantly stronger GPU, and a solid power supply (80% Bronze certified) that could actually handle twice this load compared to whatever random unit comes in the case. Nobody knows what kind of garbage those "dealers" pack in; they cut corners where they shouldn't...
And why order from here?
Right when you order, you can easily arrange for them to assemble and test the rig + shipping (which is free). They might even install Windows for you (though I think they charge for that, just call and check). Not that it's rocket science; you could just do it yourself in a few steps.
Plus an extra perk: shipping is free anywhere in the US if you spend over $667, and everything arrives within 2-3 days.