I have found this forum thread helpful when looking for a psu.
Hardforum
For a cheap, but good power supply, the Tagan 480w is good.
For a more expensive, but very good power supply, the OCZ Powerstream 520w is good.
Oh, btw, do you need a different type of power supply since you live outside the u.s.? Like a different type of wall socket or line current? I think I saw somewhere that most countries use a different type of wall power outlet and higher voltage than we do in the us. We use 110-120v with a socket that looks like '.'
I've heard that for sli, dual rail is not better than 1 single high amp rail. I think a single rail with a high +12v rail amperage is best (28+a) from what I've read (at least easier to use).
Are you going to get 4 512mb dimms to get 2gb, or are you going to get 2 1gb dimms to leave room for expansion? I think I would get 2 1gb sticks so that it leaves room for expansion.
Corsair and Kingston are both good brands, choose whichever is cheaper. Remember while looking at ram, the lower the cas latency, the faster the ram. 2>2.5>3. Although getting really fast ram can cost much more than standard ram for the small increase it gives.