Best laptops 2011

I have done a lot of research and narrowed it down to these 4

Dell Inspiron 15R
Intel® Core™ i5-480M Processor (2.66GHz, 4Threads, turbo boost up to 2.93Ghz, 3M cache)
4GB (2 X 2 GB) 2 DIMM DDR3 1333Mhz
500GB 5400RPM Hard Drive
ATI Mobility Radeon™ HD 550v - 1GB

HP Pavillion dv6
Intel® Core™ i3-370M Processor 2.4 GHz
3 GB DDR3 (1 x 1024 MB + 1 x 2048 MB)
320 GB SATA Hard Disk Drive 7200 rpm
ATI Mobility Radeon™ HD 5650 Graphics (switchable) with 1 GB dedicated

Dell XPS 15
Intel(R) Core(TM) i3-380M processor (2.53GHz, 4Threads, 3M cache)
4GB 1333MHz DDR3 SDRAM (1 x 4G)
500GB 7200RPM Hard Drive
1GB NVIDIA® GeForce® GT 420M graphics with Bluetooth (with WIDI)

Lenovo IdeaPad Z560
Processor Intel® Core i5-460M
4G DDR3 1066MHz
500G 9.5mm 5400rpm
Nvidia 1Gb Graphics