Adrico, be careful -- U.S., European, and Asian DVDs often are in different formats. Check out whether you'll actually be able to play that Japanese DVD set on your machine.
Yeah Darth, I mean Welsh, it looks great. I have seen the picture of your colection before but I had never noticed the Columbo picture when they are all together.
They are very expensive. I think it works out something like £60 per box of 2 volumes. Each volume only has 2 episodes. I was lucky enough to find the complete collection on ebay and bought that.
There is someone selling the complete set now. Heres the link