no doubt, 550v is better than 520m..
but if you are looking for HD gaming & movies then u should go for
Dell 14R (Core i3,3GB RAM,320GB HDD,ATI 5650 HD, 14" HD LED at 38,500 including all taxes)
or
Acer 5742g(Core i5 2.24,4GB RAM,500GB HDD,ATI 5650 HD,15.6" AT 40,000)
Or
Acer 4820tg(Core i5...