for your budjet, dell inspiron 6400 is good option at rs 49,900 .e-value code Q540208. you can customise and add Nvidia or ati graphic card form dell india web-site. there are lot of customise option and will show price in real time.
after looking for laptop in all branded segment, i found this cheapest.
http://www1.ap.dell.com/content/prod...=in&l=en&s=bsd
DellTM InspironTM 6400 Notebook
Intel® CoreTM 2 Duo Processor T5500 (2MB Cache, 1.66GHz, 667MHz FSB)
Genuine Windows VistaTM Home Basic
15.4" Wide Screen XGA TFT Display (1280x800 res.)
512MB DDR2 SDRAM at 533MHz (1X512MB)
80GB1 5400RPM SATA Hard Drive
Free upgrade to 1GB 533MHz DDR2 SDRAM (2x512MB)
Free upgrade to DVD Burner
Rs 4,000 Cash Off
E-Value E-Value Code :Q540208
From
Rs.49,900
Price after savings (Price excludes taxes and delivery charge)
Expires 23-02-2007.