Well, I would buy a PSU that will carry you through the next couple years. So if you think you might get a Core 2 Duo with lots of RAM and nice graphics card, buy a PSU that will meet those needs now, then you will not have to buy another later.
Yes that's what i have in mind , the present RAM ( 2x 1gb DDR2) is only pretty recent so ideally i'd like to use that in a replacement (compatible) mobo .
I definitely see the sense in going for a good make PSU ,ie corsair of a sensible wattage (around 400-450 w) -i'm not intending to load anything excessive beyond a standard set up .
Any PSU suggestions to suit these requirements ?