I bit the bullet and ordered last Tuesday an Iomega minimax from the Apple Belgium store. They have a special discount running till the end of this year where you buy the 200GB for the same price (199 €) as the 160 GB.
As a strange aside, the Iomega Europe site does not sell the 200GB anymore, only the 250 GB so my guess this is one or other Apple deal with them to get rid of some overstock ?
It arrived the Friday morning, and I have since installed it after reorganising my desk. It fits very nicely under my Mac Mini and is fast enough. It connects via an ultra-short firewire cable that is delivered with it. However, the fan generates more noise (when it activates, which does not take long when you use it) than the Mac Mini itself.
At first I was going to boot from it using the firewire link between them, but I’ve come to enormously appreciate the (almost) silence from the Mac Mini, so I am going to try to keep on using the Mac Mini as initial boot drive and put all my backups and large files (like Garageband, iPhoto and iDVD projects) on the Minimax drive.