I have a Prodigy and it's frankly too big for itx. You loose a lot of the advantages you gain from having a tiny motherboard. If you want to fit big radiators then I guess its fine, but the footprint is awkward imo.
If I had to do my build again, I'd probably go with either of the Fortress series from Silverstone.http://www.silverstonetek.com/product.php?pid=291
Not an ITX case, but much smaller than a Prodigy and can fit normal components and a microATX motherboard.http://www.silverstonetek.com/product.php?pid=333
ITX version is really small but it can't fit the same mainstream components.
I know neither of those are really what you are looking for really, but it's perhaps worth considering "bigger" cases that are actually smaller in the real world, as a lot of people make micro ATX cases that ITX boards will fit fine into.
If that doesn't appeal, I know Lian Li make a few different ITX cases which I had a look at, though I'm really not sure of the space in them, they all seem pretty compact.