I was glad to get a score of 420,521,550 with Ikuo in Ver 1.01 today, which meets my goal of getting the #1 spot on the xbox live rankings with Ikuo (though who knows how long that will last).
The replay is on Xbox live, so you can check it out if interested. I had 224 million in the first loop with one chain break. Decent second loop, though there were quite a few chain breaks and I didn't score well on a few bosses and midbosses. Theoretically with fewer mistakes I could do 430~450million, though I am not sure I will bother, since Ver 1.01 runs take so much time (over an hour for each credit), and there are so many things that can go wrong, ruining a good run. I'm quite satisfied with this score and anything higher than this would just be icing on the cake for me.