Need some help with my first build!

[Higgs1]

A user on another forum recommended me these parts for my build

MB
GIGABYTE GA-Z68X-UD3H-B3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard 164.99

CPU:
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) 4 x 256KB L2 Cache 6MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I52500K 219.99

Heatsink:
ZALMAN CNPS9500 AT 2 Ball CPU Cooling Fan/Heatsink 42.99

RAM:
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C8 79.99

PSU:
Antec High Current Gamer Series HCG-620 620W ATX12V v2.3 / EPS12V v2.91 80 PLUS BRONZE Certified Active PFC Power Supply 69.99

GPU
EVGA 012-P3-1571-KR GeForce GTX 570 HD w/Display-Port (Fermi) 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card 324.99-299.99 After MIR

HARDDRIVE:
Western Digital Caviar Black WD5002AALX 500GB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive 59.99

DVD Drive:
LITE-ON DVD Burner - Bulk 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model iHAS124-04 - OEM 18.99

CASE:
COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case 54.99

Total: 1036.91 shipping costs not included, but that is about 10-20 bucks normally with newegg.



However I was looking at changing the i5 out for:

Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor BX80623I72600K $314.99

and I added

Microsoft Windows 7 Home Premium $99


Logitech MK550 Black USB RF Wireless Ergonomic Wave Combo $59.99

ASUS PCE-N13 PCI Express Wireless Adapter $27.99

ASUS VW246H Glossy Black 24" 2ms(GTG) HDMI Widescreen LCD Monitor$199.99


Total: $1536 +$25ish shipping......


Is it worth upgrading from the originally recommended i5 to the i7? Its about a $100 difference so not huge deal, and what about my add ons? This would be my first full PC build, so is there anything else I would need? Thermal paste? anything? Also my goal is to be able to play upcoming games like BF3, Skyrim, ME3 on the highest settings to make it worth it for me to play them on PC instead of PS3.

What do you guys suggest?


Also, I haven't been into PC gaming for quite some time, I was huge into Battlefield 2 and when HL2 first dropped that was when I was really into it, then I dropped PC in favor of Mac. I will continue to use my macbook for day to day use and the PC would only be for gaming, so any other recommendations would be great. And if you can bring the cost down further or tweak in any way for the better feel free to let me know!

Thanks