Lenovo G560 59â€050870 --> P6100/1G DDR3 1066MHz/320G 9.5mm 5400rpm/Intel GMA HD/Camera /Bluetooth 2.1/HDMI/Card Reader /Num Pad / Rambo Tray in 12.7mm/Black 6Cell 2.2A/15.6 HD LED/Freeâ€DOS/1 yr warranty parts & Labour --> Rs.23190.
You can add a 2GB DDR3 laptop RAM for ~ 1.9k and this makes a great deal for 25k

One -ve of this model is mediocre track pad and the swapping of the positions of Ctrl+shift keys.
Samsung R528-DA04 --> Intel Pentium Intel® Dual core-2.2GHZ 2Gb DDR-3, 250GB, 15.6†LED HD, DVD Super Multi, 10/100 LAN, Web Camera, HDMI Port, 3W Stereo Speaker, 2 x USB 2.0, Numeric Keyboard,NO-BT 6Cell Battery, DOS, 1Yr Pick up and Drop Warranty --> 24,500.00
Remember that the Pentium dual cores don't support virtualization and thus u can't install s/w like VMWare and run OS within a OS. Dual boot is the only option if u want to use both Win7 and Linux.