Yes, the blackice prime is pretty good. Probably not quite as good as some heater cores, but it looks better and is smaller so that's a plus.
Talking to the guys at [H]ardOCP's forums, I've actually decided not only to not go for the Blizzard case at OCH, but to actually look at building my own watercooling kit and my own case.
So I'll be designing and building my own plexiglass case with the water cooling in mind from the beginning. For the watercooling setup, I'm going with the TC-4 block from Dtekcustoms. Their spiral block is also quite good and quite sharp. I'm going with a black ice extreme radiator and probably a Danner magdrive pump which will be submerged in a homemade reservoir (also made of plexi). All in all, it should be pretty darn sharp.
I just wish I could find something like waterwetter or purple ice that's totally transparent. If anyone has any suggestions on that, please let me know.