I highly recommend you and advise you for 32bit Because it doesn't make any problems at all and with a PC like that it would be a great one

Don't believe who says 64bit , i got another PC on my house which has 64bit and with good graphics card and RAM but it restarts sometimes and sometimes it blocks , Also not i tried most of OS here but didn't work ONLY UbuntuXP worked but i changed style to normal Windows XP and made it just like Windows XP SP2
Like i said , Choose 32bit because it's better and it doesn't make problems...