Which power supply(SMPS) would be Best

Hi friends,
                   Right now I am using Intex 450W power supply. I have connected one usb wireless adaptor of netgear and also connected usb speakers of logitech. Sometimes, I also use USB portable HDD seagate freeagent. and I have also connected two internel HDD one is of seagate and other is of WD hd. But problem is that weird noise is coming from computer. I think its due to powersupply bcoz I already replaced heatsink and cpufan and also cleaned the dust. I want know, should I use 550 Watt instead of  450 Watt bcoz may be, i am using so much usb devices. So, its not able to give accurate power to all components. So, tell me should i use more watts of power supply.
                 
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Ashok DewanFreelancerAsked:
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remixedcatCommented:
yes, I recommend, in a good pc at least a 600 watt. antec, xigmatek are good companies.

PSUs will often go bad and the fans in the cheapo ones go out fast. I had this brand called echostar (not the dish network company!) PSU brand and I went through, kid you not 5 in 3 years. really bad.

do not go cheap on PSUs. a cheap PSU can do more damage to your PC then the cost savings are worth.
epichero22Commented:
It sounds like 450 is enough for your components.  You typically have to go with a larger PSU once you add power hogs like high-end video cards.

If the sound is coming from your PSU, replace it with a known good brand like Antec, Thermaltake, OCZ or Cooler Master.  If you are upgrading to 550 watts then there will be a lesser change of fan noise since it won't have to work near or towards capacity to power your components.

You can look up your recommended PSU wattage by going here:

http://extreme.outervision.com/psucalculatorlite.jsp

Whatever the readout is, add around 25 - 30% more to the total amount and upgrade to a PSU with that rating.

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