Hello all: FINALLY I am getting my laptop, G4 1.25 15" PB, it comes with 512mb of Ram. Should I be looking to upgrade this right away? How much of an impact does going to 768 make on system performance? I am going to be doing some imovie and iDVD stuff, just some home movie type things and I was wondering if this was an upgrade I need right away? I might do it anyways, since the moons are aligned and I have access to the money, but I think its Kind of silly since I will actually only be going up 256Mb when I buy my 512mb, so I was just windering if this will make an overall improvement that I will notice in day-day usage?