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MSI 15.4 inch laptops
With these models you can choose between the budget right up to the high end machine
These models come with 2 years global warranty through MSI with a large number of service centres worldwide.
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MSI 15.4 inch budget laptops with shared graphics
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These budget 15.4 inch laptops have shared graphics - Click Here

Models have the entry level Intel® Pentium® Dual-Core which is fast enough for a lot of programs etc, and they have enough ram that you require for the operating system.
They have a numeric keypad which is ideal for entering in data and large hard drives which are large enough for your requirements. They also have a dual layer DVD burner for backing up your files.

MSI GX620 15.4 inch laptops with dedicated 512MB graphics
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They have 512MB dedicated graphics for gaming and video editing - Click Here

These models have a powerful Intel® Centrino® 2 processor 2.4GHz, more than enough ram that you require for the operating system without the need for upgrade. 
They have large hard drives which are more than enough for your requirements, as well as the dual layer DVD burner for backing up your files. The ideal gaming laptop or for high end video editing.