well, first of all, sticking with budget along with a good configuration is important, i suggested cheap PSU doesn't mean that it is sure that they will damage your system, but this just increases the probability,
OP has a budget in which its impossible to configure a PC, and OP wants to stick with that budget. so i suggested a less reliable psu.
Not all people buy 4k PSU or 2K psu to handle their CPU, still they run games, i've too used a cheap 400W PSU(came inbuilt with my HCL desktop) on ati 4670 card, and overclocked and played successfully for a long time because the processor+card i suggested doen't require that much power. + however, i've already indicated OP to buy a branded PSU in my above reply in which i quoted cilus. so there remains no question on PSU suggestion.
and
I'm a bit late in replying to this thread as the original post was actually overlooked by me.
The same thing stated above goes with the selection of cabinet.
dude, OP has demanded a whole brand new PC in 20,000 and you are talking about cabinet selection, none of us can mention every component a branded one in that budget....
now please don't start thinking here of death adder/ mx518 for user...