Asus laptop should buy what?

I was torn between Asus and K450LC- WX080D A450CC-WX138.

Sender: Strong 
Email: manhdh.th@gmail.com

Hi everybody.

His situation is preparing to buy a laptop to work in service should ask people who have experience using this machine over 2, consulting fears.

On purpose: I bought the machine for use mainly for work, a little entertainment, a little game. His work often use software such as CAD, Office, some soft programming. His work also needs to work a lot.

The last day before going shopping Pico 2 children found this quite eye-catching and very stable configuration but also wondering what you choose not to know.

Ostensibly his two children are noticed almost identical (quite nice).

Configuration details:

1. Asus K450LC-WX080D: 14 ​​million. 
OS - OS: No 
Processors - Core i5 4200U CPU (2 x 1.6 GHz up to 2.6 GHz) 
Internal memory - 4GB DDR3 RAM 
Hard Drive - 500GB HDD 
Graphics processors - GPU NVIDIA GeForce GT 720m 2GB DDR3 
Screen size - LCD 14 "LED Backlight 
Optical Drives - ODD: Yes 
Wireless networks - WiFi: Yes 
Webcam: Yes 
Bluetooth: Yes 
Finger print: No 
Battery: 6 cell 
Weight: 2.1 kg

2. A450CC-WX138: about 13 million 
Intel Core i5-3337U Processor (3M Cache, 1.80 GHz) to 2.7 GHz up 
Chipset Intel HM76 Express Chipset 
4GB DDR3 1600MHz SDRAM Ram 
750 GB SATA Hard Drive 
14-inch screen - 16: 9 HD (1366 x 768 pixels) LED Backlight 
NVIDIA GeForce GT 720m graphics with 2GB DDR3 VRAM 
Integrated Intel HD Graphics 4000 
CD / DVD Super-Multi DVD 
Audio Built-in Speakers And Microphone 
Lan 10/100/1000 Base T 
Integrated WiFi 802.11 b / g / n 
Camera HD Web Camera 
Card reader, 3-in-1 card reader (SD / SDHC / SDXC) 
2,600 mAh Battery 4 Cell 37 Whrs 
Operating System Free Dos 

I was rather puzzled people should seek advice to select one of two "I" is.With this price range if there is a good used machine you please? Also recommended.