New laptop needed.

Hey guys, first id like to say thanks to everyone who helped me with my old computer

But today I was thinking what could I get my sister for her upcoming birthday, so i have decided on a new laptop for her

BUT I need a little help...
Firstly if you guys could recomend something under £700-ish.
I want her to be able to play CoX on pretty nice graphics but she also uses alot (of my) memory.

If you guys can give me any suggestions it would help a bunch!

Thanks.