my old computer now not working. i need to buy new motherboard and cabinet.

own old INTEL pentium D 2.8GHZ, 2 x1GBDDR2 ram, 500gb sata, IDE samsung DVD writer.
i need a new motherboard for installing this and need a cabinet @ lower price and lasting one. bcoz i use about 12hours a day.
plzzz tell me which one and price also.
i am from INDIA, KERALA.