It looks on the expensive side, but that depends on what you plan to do with it, AND how long you want this box to last before you have to break down and buy a new one.
Video:
This card will take up 2 slots. Your x4 PCI slot will be unusable. Also, you might get by with the GV-N460OC-768I. It's the same card with a little less memory and is about $100 cheaper.
This card is ALREADY overclocked. That's why it has those fans. I wouldn't try overclocking it any more. You'll probably have to put the video card in slot 1 to avoid the heatsink on your mainboard's southbridge.
HDDs:
I have no experience with Samsumg drives, either. I tend to stick with WD or Seagate. I'm currently using a few Western Digital WD10EADS 1TB drives. They've run really well, and I'd recommend the drive. The AV drive doesn't look much different than the WD10EADS, but I'd stick with it if you're planning on stea...err, using alot of multimedia.
Case:
Looks nice. Plenty of fans and room to add more drives in the future. The only problem is that your power supply has a top fan that this case would completely block. You'd have to mount this particular supply upside-down in the case.
Mounting bracket and solid-state disk:
You may not need these - it depends on what you plan to do. Sure, it's fancy, but I'd consider just getting another internal HDD - would likely be cheaper.
Mobo:
Looks decent. Onboard audio means you can save some money now and still get a dedicated card later. Mind that the north and southbridge heatsinks don't get in the way when you start assembly. Just one big potential problem - the IDE (PATA) connector faces forward, but from what you have listed, you won't be using it, anyway.
Power:
Nice. Modular connectors are good. Again, in this case, you'd need to mount the supply upside down to accommodate the fan.
CPU, memory, and cooler:
I use AMD, but this looks like a reasonably powerful CPU. Check if it's cheaper to buy 2 4GB sticks of memory, instead. When you install the cooler, its fan might conflict with the heatsink on the northbridge or the first memory slot. Be prepared to make a few "adjustments" as things come together.
DVD/CD:
OEM means no burning software included. You'll have to supply your own.
OS:
This version of Win7 is 64-bit. CHECK and make sure there are 64-bit drivers available for your video and mobo. I'm not doing it for you here. You'll be tech support for this system, so you need to know. Be aware that 64-bit systems will run 32-bit OS, you just won't get the full power out of it and be limited to half the total possible memory on the mobo.
Good luck and good build. Take it slow and try not to bend any pins. Have good lighting and a clean work area. Also, have the right tools, something like
www.rosewill.com/products/557/productDetail.htm
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