First of all, thanks to everyone who helped me out.
@Sam I looked at the ITWares site and it seems like they don't have the FSP 500W or the Gigabyte 460W. I had also heard that there were some problems with the Corsair 430 earlier on. Have they been fixed in V2? Also I found the Seasonic 400W on the ITWares site at the same price as the Corsair. Which of them would be better or doesn't it matter as both are reputed brands with 80 plus and active FPC?
@topgear Sorry for the confusion, I meant that I calculated the power requirements for my rig with any additions I would make over the next couple of years including a modest graphics card (I think I checked against the HD 5670) would be 290W. Honestly speaking I don't see myself getting a very powerful gfx card even in the future as I am happy to use my xbox for gaming.
@thetechfreak I checked the online sites again and unfortunately neither theitwares nor primeabgb seem to carry the FSP 500W any more. I could however, find it on bitfang. Has anyone got an idea about the reputation of bitfang?
Once again thanks all of you for responding.