And that's true: you don't know about hidden defects until you actually see the drive in operation. And I would still need a 3.5" adapter bracket and IDE-adapter which I would need to order -- would I run the risk of getting a faulty drive for only 15 euros less?
Well, the answer is, of course, "No". So today I ordered a 30GB Fujitsu Hornet and the adapter bracket for just under EUR 100 total. OK, so it's not the fastest drive out there (4200 rpm and 2MB cache), but I will need it for media streaming and not lots of little seeks. It comes with a 3-year warranty, so that's a nice added bonus. It's rated at 24dbA, and uses only 2.30W when operating -- so it should be one cool drive!
It'll take 2 days to get here (according to the site), so I expect it thursday.