Help please, new to building

Help please, I have no idea if the fans or other small upgrades are actually worth it, but am scared that if i don't do everything to cool down my computer than the overclock will fry. Went air cooling cause I've read a lot of negative reviews of broken radiators from liquid cooling.
1920x1200 monitor
Want the option of expanding to SLI if i get some extra money later this year.
EDIT: found out how to link

Configuration

*BASE_PRICE: [+899]
BLUETOOTH: None
CARE1: Professional Wiring for All WIRING Inside The System Chassis - Minimize Cable Exposure, Maximize Airflow in Your System [+19]
CAS: Corsair Carbide Series 400R Mid-Tower Gaming Case [+33]
CASUPGRADE: None
CD: 24X Double Layer Dual Format DVD+-R/+-RW + CD-R/RW Drive (BLACK COLOR)
CD2: None
COOLANT: Standard Coolant
CPU: Intel® Core™ i5-2500K 3.30 GHz 6M Intel Smart Cache LGA1155 (All Venom OC Certified)
CS_FAN: Maximum Enermax 120MM Case Cooling Fans for selected case (Maximum Silent Operation) [+29] (500-1,200 RPM T.B. Silence Black Color with Red LED Twister Bearing 8-14 dBA [+0])
ENGRAVING: NONE
FA_HDD: None
FAN: * Thermaltake Frio OCK CPU Cooler (Designed for Over-Clocker King)(CLP0575) [+38]
FLASHMEDIA: INTERNAL 12in1 Flash Media Reader/Writer (BLACK COLOR)
GLASSES: None
HDD: 2TB (2TBx1) SATA-III 6.0Gb/s 64MB Cache 7200RPM HDD (Single Drive)
HDD2: None
IEEE_CARD: None
IUSB: Built-in USB 2.0 Ports
KEYBOARD: Xtreme Gear (Black Color) Multimedia/Internet USB Keyboard
MB_SRT: * 60 GB OCZ Agility 3 SATA III 6.0Gb/s SSD - 525MB/s Read & 475MB/s Write [+106] (Single Drive)
MEMORY: 16GB (4GBx4) DDR3/1600MHz Dual Channel Memory (Kingston HyperX)
MONITOR: None
MONITOR2: None
MONITOR3: None
MOTHERBOARD: [CrossFireX/SLI] ASRock Z68 Extreme4 Gen3 Intel Z68 ATX Mainboard w/ Lucid Virtu, Intel SRT, UEFI & 7.1 THX TruStudio Audio, GbLAN, HDMI, USB3.0, SATA-III RAID, 3 Gen3 PCIe X16, 2 PCIe X1 & 2 PCI [+68]
MOUSE: XtremeGear Optical USB 3 Buttons Gaming Mouse
NCSW: None
NETWORK: Onboard Gigabit LAN Network
OS: Microsoft® Windows 7 Home Premium [+104] (64-bit Edition)
OVERCLOCK: Extreme OC (Extreme Overclock 20% or more) [+49]
POWERSUPPLY: * 750 Watts - Corsair CMPSU-750TXV2 80 Plus Power Supply - Quad SLI Ready [+93]
PRINTER_CABLE1: PPA 6FT HDMI to DVI 18+1 Male Black Cable [+10] (1 piece)
RUSH: 5% Instant Rebate for Non-Rush Delivery Order over $999 - Ships within 3 Weeks - Must Enter Coupon Code "NORUSH" during checkout [+0]
SERVICE: STANDARD WARRANTY: 3-YEAR LIMITED WARRANTY PLUS LIFE-TIME TECHNICAL SUPPORT
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
SPEAKERS: None
TEMP: None
TVRC: None
USB: None
USBFLASH: None
USBHD: None
USBX: None
VIDEO: NVIDIA GeForce GTX 570 1.2GB 16X PCIe Video Card [+226] (EVGA Superclocked [+25])
VIDEO2: None
VIDEO3: None
WNC: None
_PRICE: (+1699)
_view_: {C130C328-0252-45F0-8918-164AB88CF897}
_load_: 1/1/2012 2:08:37 AM