I have some slightly modified info from Aurender re: the upgrade - it's only $200 rather than $500. Here's an ( edited ) excerpt of an email from their support team:
"Both the N10 and N100H are upgradeable as well. There is actually some erroneous information in that we are only charging $100 per drive (so $100 for an N100H and $200 for an N10) to perform the upgrade at Aurender in Anaheim, not $500. The drives will need to be purchased from Amazon or an authorized reseller, and drop shipped to our Anaheim office with a reference to the unit being upgraded, and the customer is responsible for shipping both ways. "
At this price - aside from the downtime to do the upgrade - seems like a no-brainer to me.