Go for a HCL P38 PDC.....its a great laptop...even i have one of those..has 3 GB RAM,320 GB Hard Disc,Nvidia 8200 Graphics......Wifi,etc,etc,etc..
Only 1 drawback..Has No Preinstalled OS..

but should be quite easy to find an OS nowadays.....as for mere 100 bucks u can get Windows XP Installed..