Pretty much what the title says .. I'm planning to buy the 2.3GHZ model of the new retina MBP, but I can't decide if the extra RAM are worth it .. I know that I won't be able to update them in the future (right?) and that is why I'm having difficulties on deciding ... I intend to keep that computer for at least four years .. I don't use programmes that require large amounts of RAM, but I'm worried that 3 or 4 years down the road, 8GBs might not be enough even for simple tasks .. What do you guys think ? Should I spent the extra money, or 8GBs will be just fine for me ?? Thanks in advance !