I just got PowerMac G4 Digital Audio 466Mhz for free and was wondering what OS to put on it, Panther or Tiger? It has 256Mb currently and two 4Gb hard drives (not 40) but I hope to change the hard drive issue soon. If I upgrade the ram, which I might not because I don't want to spend money on it. Would it be worth it to go for a 768Mb or would 512 be fine? Thanks.