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Wanting to build a new computer and I'm wondering if these parts are compatible

Budget: $600 USD
Your Location: USA
Main Purpose: Gaming
Multitasking: Medium
Games: Portal 2, The Sims 3*, Team Fortress 2, Killing Floor, Minecraft, Skyrim*, Counter-Strike: Source, Dota 2, Half-Life 2, Trine, Battlefield 3 (I can already run most of these games, but I want them to run faster)
*Games I can't run properly
Resolution: Current Monitor Resolution: 1920 x 1080 x 59 hertz (bits/pixel=32)
Overclocking: None.
Peripherals I have: Keyboard: Enhanced Multimedia PS/2 Keyboard
Mouse: Microsoft PS/2 Mouse
Speakers: Realtek High Definition Audio
Recycled parts: I'm going to keep the keyboard, mouse, and speakers. (for info, see above)
Parts~:
CPU: Intel Core i5 750 - 2.66 GHz Quad-Core Processor
CPU Cooler: Arctic Cooling Alpine 11 GT Rev 2 CPU Cooler (up to) 75W Support Intel-1156 775
Motherboard: Intel BOXDH55PJ LGA1156 Intel H55 Micro ATX mATX Motherboard DH55P DVI VGA DDR3
Memory: Corsair Vengeance 8GB (2x4GB) DDR3 1600 (PC3 12800)
Hard Drive: Western Digital VelociRaptor 600 GB, Internal, 10,000 RPM, 3.5" (WD6000HLHX)
Video Card: ASUSTeK NVIDIA GeForce GTX 550 Ti ENGTX550 TI DC/DI/1GD5
Case: Antec NSK 4482BNS Black 0.8mm cold rolled steel ATX Mid
Power Supply: Corsair Builder Series ATX12v/EPS12v 600W
Optical Drive: ASUS 24X SATA DVD Burner, 8X DVD+RW, 16X DVD Reader, DRW -24B1ST/BLK/B/AS OEM
And the OS I'll be using is Windows 7 Home Premium 64 bit. (DVD SP1)
Are all of these compatible? ggrggrga

P.S. IF there are any other parts that are cheaper/better(for the games) can you let me know pretty please
