Its better to stick with a good known brand of PSU, Cheap unbranded one have less circuit protection as may of been said, if you looking for good ones take a look at these.
2. silver stone.
3. Ocz if on a bit of budget.
On most if these, you will find quiet a few protection features to protect the rest of the system next time a Psu pops with age or use Limiting any damage to other components of the pc.
Have a look here because listing the type of power protection that a good Psu should have.http://www.overclockers.co.uk/productlist.php?groupid=701&catid=123