Lowest priced and trendy - Nintendo Wii
xbox - xBox live capability to enable to interact with other gamers, but 11 year old girls likely could not care less about it and therefore irrelevant
PS3 - Blu Ray capability - (but also most expensive)
but I also recommend this
http://www.apple.com/ca/ipodtouch/features/
Reason - she can bring it with her wherever she wants to. The consoles you mentioned, cannot be carried outside her house with her. Also, she can listen to music with it.
If you get her a gaming console her parents will also be required to buy games for her but there are a plenty of free (or near free) quality games for the iPod touch and she can surf the internet and write emails wherever there is Wi-Fi (StarBucks, her house, public libraries, Tim Hortons locations)
I just checked BestBuy website and if you want to choose the option with least financial investment, Wii is the one at $149
I feel any option stated above might be a really fine option except the xBox in which I see no particular benefits
Edited 8/12/12 by PuppyWorld
Edited 8/12/12 by PuppyWorld
Edited 8/12/12 by PuppyWorld
Edited 8/12/12 by PuppyWorld
Edited 8/12/12 by PuppyWorld
Edited 8/12/12 by PuppyWorld