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It is a very good config. It is very tough to get a PC below 18k with a dual core CPU. If your budget is really tight, you could save further by buying an ASUS motherboard & DDR2 RAM. But since you have accepted this, I suppose you are good with this budget. Still, I would suggest you get a 17" wide screen If it fits.
Also, don't compromise on the keyboard mouse, a cheap logitech is much better than local products priced a little lower. Logitech's would last long. Also, don't go for a frontech cabinet, iBall or zebronics would be better. I'm suggesting these because retailers try to sell Microsoft instead of logitech & things like that. Don't let the retailer's suggestion change your decisions (config).