I have a dell vostro 200 slim tower

[Aidenk]

Hello I have a dell vostro 200 slim tower which I am upgrading for gaming purposes

It has Windows 7 64 bit
4gb of ram
500gb memory
500gb hard drive

I'm upgrading the power supply to 400 watt once i find one but I'm not sure what low profile graphic card would be good to fit into it

I mainly want to play games like fall out,skyrim such games like these

 

[Dark Lord of Tech]

Slim Setups aren't worth upgrading too limited on choices. No good PSU's or GPU's.