Which Screen is good for gaming?

if you're willing to pay $365 bucks you should try to get something bigger. Just last week I saw on a deal for a 23 incher for about $180. Regardless of the response times, which are manipulated by the manufacturer to sell products. the screen size will better suite your TV and PS3 needs.
 
Get the samsung because LG uses white LEDs which has a lower color spectrum than Samsung's LED Blu technology.

Still CCFLs have the same if not better color spectrum than regular LEDs. You should try something 120hz or something with a cheaper price because LED has little advatange unless you want low power which is only a problem with huge displays.