I'm a songwriter and I don't have BIAB but have heard good things about it. When I get rich, I'm gonna buy loads of software. Now, it's just me and psr2000.

I don't know the Roland keyboard but the Yamahas are great. PSR3000 or Tyros won't do you wrong. Main thing being, you want a way to capture song ideas. You noodle around awhile, find something you decide you like and you record it on the keyboard. Either one of those will do fine.