30k branded PCs, say Dell Inspirons won't let you play games, except many many year old ones.
Are you open to custom configs?
Athlon II X3 445 @ 3.4k
MSI 880GM-E35 @ 3.5k
Corsair Vengeance 4GB @ 2k
MSI HD6670 1GB GDDR5 @ 5.6k
FSP Saga II 400W @ 1.6k
CM Elite 310 @ 1.6k
BenQ G2220HD FULL HD LCD @ 7k
Seagate 500GB @ 1.7k
Logitech Multimedia Combo @ 0.7k
LG 22x DVD RW @ 1k
Altec Lansing BXR 1121 2.1 @ 1.1k
Total = Rs. 29,200
Fits everything you would need perfectly!
Good display for surfing, watching movies, and the HD6670 will provide enough punch to satisfy your casual gaming needs.