I have a Titanium G4 1ghz now. If I upgrade to the New G4 Powerbook 1.67ghz will I see a signifigant increase in speed or will it be hardly noticible? They will both use the same hard drive a 60gb 7200 rpm drive as I will transfer my existing drive into the new computer and they will both have 1gb ram. I can get $1500 for my tibook so is the $800 upgrade price worth the 670mhgz speed increase? Bluetooth and Wireless G mean nothing to me. Thanks.