It is a 17''/1.25ghz G4/768mb ram/64mb video/superdrive/80gb Is it worth upgrading? right now it has 10.4 but i really could use the Spaces and overall leopard finder etc? would it run okay? later on i plan on getting a 1gb bringing it up to 1.25gb? should i wait till then? or is it fine? what are ur experiences?