The power supply is one of the most important pieces to a reliable
system and one that is the most overlooked until you start having
problems. Pay the money and get a trusted name brand and if you
are at all forward looking I would get as close to 500 watts or better, you will need it later, you always do.
I have been real happy with the Antec "True" series PSU.
has done extensive PSU reviews &
comparisons, give it look if you like.
I also agree that 1Gig of RAM seems the standard for modern PCs.