25k is very less budget for a 'gaming rig' since you want to include a monitor too. are you a hardcore gamer or casual? which all games you will play?
He has written excluding monitor. So I guess 25k is good enough for a decent config. I am a bit outdated on the prices, so please correct me if I'm wrong
AMD Athlon II X4 640 - 5k
Gigabyte 880GMA UD2H - 4.5k
Radeon HD5670 - 5.4k
4GB RAM - 2.4k
1 TB Seagate HDD - 2.8k
FSP Saga II 400W - 2k
Cooler Master Elite 430 - 2.5k
totals somewhere around 25k
Please modify the suggestions if something is wrong. I gave a suggestion because he doesn't seem to be a frequent visitor and would be disappointed if there were no responses when he visited 2 days later