I am looking for some opinions here, in anticipation of purchasing an iMac G5 20-inch. For another $100 I can go from a 160GB to a 250GB hard drive from Apple. That's not bad, but compared to buying the iMac with the 160GB and putting that $90 towards an external hard drive.....what do you think? I could get a Lacie 250GB external for less than $190, or a Lacie Extreme 160GB for $199. And I would think that an external would have advantages over just a larger hard drive anyway, such as having your files already backed up. Any ideas?