Acer 5742G or Dell Inspirion 15R

Hi,

I want to buy one of these laptops. My purpose of laptop is to use for Development, Gaming & Movies.

Acer has specs like I5 (2.26Ghz) processor, Windows 7 premium, Navidia 1gb
Graphic card
Dell has specs like I5 (2.53Ghz) processor, Windows 7 home basic, ATI 1gb Graphic card.

I have seen Dell laptops gets overheated that really irritates me. I am not sure about Acer Laptops.

Please suggest me which one is better.

Thanks
Amit