Dont mind my comments, though,
as I would say,
Cancle E4300 go for E4400... whats the point of Both Combo + DVD RW .. isnt it waste of money ?? rathert invest that extra on better RAMs

...
If u find 16mb Buffer HDD then go for 250 GB other ways, better would be Sticking to ur old HDD (if u have any) or save money buy as small HDD as possible to prepair ur self to buy one 16mb buffer one when available...
5k budget is for PSU + CAbi, then I would suggest forget ColorSit, think of Cooler Master eXtreme 600 watts Rs. 3500/- incl TAX Kolkata

and for cabbi personally i would say any Large cabbi with well ventilated fan slots...