For those that have the 2GHz MBPro is 1 GB plenty?When I ordered mine I downgraded to the dual 512 so the faster hard drive wouldnt add cost and since I had heard using two 512's is faster than just a 1 GB stick. But this downgrade will leave me with an unneeded 512 stick if I ever upgrade. Should I change my order for the easier upgrade or will 1 GB be fine? I will not be running anything too intensive just itunes, bit torrent, idvd, imovie, iphoto, ichat, ms office etc. But many times a few will all be running at the same time.