Yes. A good PSU is a must!! I had an iBall SH*T PSU that came with my iBall crap cabby. Two of its wires burned due to some short circuit once. Then recently it wouldn't turn the system on in evenings due to low voltage. There was lots of problems with my harddrive and system stability in general.
Since I got a Corsair 650TX ( which is higher than you would need BTW . you can get a VX450), it has been peace of mind all the way. There has even been a couple of brown-outs, with the lights and all flickering, and still the PC didn't restart!!
Get a better PSU. It powers your whole system. Its worth every rupee you spend on it.