I've just picked up a seven month old used MacBook Pro for a bargain price. It's the original base model Core Duo 1.83GHz with 512MB of RAM so I'm looking to upgrade the RAM. Crucial are doing 1GB for £61 or 2GB for £122 and I'm wondering whether upgrading to 2GB is really worth an extra £61 for another 512MB? I've got 1.5GB in my dual 2GHz G5 Power Mac and that seems to cope with what I'm doing at the moment. I'm just wondering if the extra 512MB will be worthwhile, or am I better off putting the money I'll save towards buying AppleCare?