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Asus F75A-TY133D
You can have a look at Which for reveiws of Asus models, might give you an idea of their overall performance : http://www.which.co.uk/technology/computing/reviews/laptops/asus/
For internet and MS Office ANY computer on the market is fine. It's only when you work with CPU or memory intensive programs (video editing, graphic rendering etc) that you need more power. I have a Sony with the same CPU and I have no complaints. My RAM is 6 Gb (I believe the Asus is 4) but that shouldn't have a perceptible effect on the tasks you mention.