Can't decide a laptop from these

I am having a hard time choosing the best laptop for my budget.In my country the temperatures goes up to 40 degrees sometimes so i need something to be able to make it through these hard days while gaming.I have heard that ivy bridge tend to be hotter than sandy but i am not sure about that.

main uses:
Games
surfing the internet
for college(maybe some intensive programs in the future)
watching movies(rarely)

brands i am leaning toward:
Lenovo
Hp(afraid of the heating issues faced by many users in my country)
Toshiba

models i am leaning towards

Lenovo Ideapad Y570:

Intel® Core™ i7-2670QM Processor (6M Cache, 2.20 GHz)
8GB DDR3 RAM 1333MHz
750GB HDD 5400 rpm
DVDRW DL drive
15.6" HD LED Glare display (1366 x 768)
NVIDIA® GeForce® GT 555M GMA with 2GB dedicated VRAM
Web Camera
WiFi - Bluetooth + EDR - USB - Ethernet 10/100/1000
HDMI
Touchpad
6 Cell Lithium-Ion
Windows 7 Home Premium 64-bit

Lenovo Ideapad Z580:

Intel® Core™ i7-3612QM Processor (6M Cache,2.1GHz up to 3.10 GHz)
6GB DDR3 RAM 1066MHz
750GB HDD 5400 rpm
DVDRW DL drive
15.6" HD LED Display
NVIDIA® GeForce® GT 630M GMA with 1GB dedicated VRAM
Built-in Web Camera & Microphone
WiFi - Bluetooth - USB - Ethernet 10/100/1000
6 cell battery
Windows® 7 Home Premium 64 Bit

HP Pavilion g6-2209se Notebook PC:

Intel® Core™ i7-3632QM Processor (6M Cache, up to 3.20)
6GB DDR3 RAM 1066MHz
750GB HDD 5400 rpm
DVDRW DL drive
15.6" HD LED BrightView display (1366 x 768)
AMD Radeon HD 7670M with 2 GB DDR3 dedicated
Webcam with Integrated Digital Microphone
WiFi - Bluetooth - USB - Ethernet 10/100/1000
HDMI
TouchPad
6 Cell battery
Windows 8 64-bit