Why spend so much buying another cart system. Save some money, & get yours modded. Then you'll have all the blood + the debug bios which in a lot of ways works like the older game genie's. Unlocks special characters/levels/credits, etc.
Well Nick does have a point there, I personally dont know how much it costs, but it does the same thing as having a japanese system would; I believe Jeff Kurtz does those kinds of modifications. Only thing, if what you want is to have a complete, unaltered system that will display the things that the US systems dont, then obviously the japanese system delivers- really just depends on what you want to spend.