Hi,
I want to purchase a new notebook. I'm a student & will use the notebook for daily personal & professional use as well as moderate gaming. After looking at the various options available, I've shortlisted 4-5 laptops. The games I wish to play are BF3, CoD3: Modern warfare, Medal of honor etc. Weight of the laptop is not an issue. I also wish to use the laptop for at least 3-4 years so want a brand & configuration that will stand the test of time. I'm from India & also want a laptop with good after sales support. Please tell me which one would be the best for my requirements.

1) Dell 15r se (7520) - 3rd gen i5 3210 (2.5-3.1 GHz), 15.6" HD LED(with upgrade option to FHD), 1 TB, 8 GB RAM, AMD Radeon 7730 2 GB - INR 56,000

2) Dell 15r se (7520) - 3rd gen i7 3632QM (2.2-3.2 GHz), 15.6" HD LED(with upgrade option to FHD), 1 TB, 8 GB RAM, AMD Radeon 7730 2 GB - INR  62,000

3) Lenovo Z500 - 3rd gen i5 3210 (2.5-3.1 GHz), 15.6" HD LED, 1 TB, 6 GB RAM, Nvidia GT645m 2 GB - INR 54,000

4) Lenovo Y500 - 3rd gen i7 3632QM (2.2-3.2 GHz), 15.6" FHD, 1 TB, 8 GB RAM, Nvidia GT650m 2 GB DDR5 - INR 66,000

5) Asus K55VM-SX086D - 3rd gen i7 3610 QM (2.3-3.3 GHz), 15.6" HD LED, 1 TB, 8 GB RAM, Nvidia GT630m 2 GB - INR 52,000

Please help me choose between these.
Thanks in advance!