I'll sugest u for buying an intel processor pentium 4 2.66+ lga 775 socket
and gigabyte 915 chipset mobo it cost u upto 10k or + but if u want a graphics card the graphic card will be used on this mobo is pci express and if u buy one graphic card go for ati graphic cards but all of them will not come under 15k they will be of approx. 20k or +.