I'd take duplicate content over thin content. There are tons of eCommerce sites out there with duplicate product descriptions. I don't think that Google is going to penalize you, per se, they just might not include your pages in the search results in favor of whatever site they think is the originator of the content.
The reason I think duplicate content is better is users. Either way your search traffic is probably not going to be too great. With duplicate, the SE's may ignore your pages and with thin content you haven't given them a reason to rank you. But at least with some real content on the pages you may be be able to convert the visitors you do get.
That said, I like Egol's suggestion. Don't write new product descriptions yourself. Hire a bunch of people to do it so they can crank out the new content real quick.
Kurt Steinbrueck
OurChurch.Com