This is the first computer I ever built (for gaming and extreme multitasking purposes) and I just wanted to know from some people who definitely know a lot more about computers than myself .. How good is this thing?
I like to stream, download movies, listen to music, and game at the same time .. So I'd like to know if this setup will do the trick

Video Card
MSI N560GTX-Ti Twin Frozr II 2GD5/OC GeForce GTX 560 Ti (Fermi) 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.newegg.com/Product/Produc...82E16814127608

Case
Thermaltake Chaser MK-I (VN300M1W2N) Black SECC ATX Full Tower Computer Case
http://www.newegg.com/Product/Produc...82E16811133191

Motherboard
ASUS P8Z68-V LE LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
http://www.newegg.com/Product/Produc...82E16813131773

Power Supply
CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
http://www.newegg.com/Product/Produc...82E16817139021

CPU
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K
http://www.newegg.com/Product/Produc...82E16819115072

RAM
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL7D-8GBRH
http://www.newegg.com/Product/Produc...82E16820231402

Hard Drive
Western Digital Caviar Green WD15EARS 1.5TB SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Produc...82E16822136513

If you see room for improvement feel free to let me know.
All feedback is GREATLY appreciated. Thank you so much guys!