Man, I really don't want to buy a PS3 just for Yakuza. But those games look SOOO good!
Do eeeeet. I was on the fence about Yakuza for a long time, and finally hopped on board with Yakuza 4. Strange as it may sound, it reminded me a LOT of Shenmue, but with better combat and voice acting.
I have a feeling we won't be getting the HD collection or Yakuza 5 in the US, though. Sega's gotten really jittery lately, and as far as I know, has yet to confirm either of them.