Kona Cafe 100% please keep it. It's IMO one of the still good ts places in WDW. Though I haven't eaten at Raglan Road or Biergarten personally I'd try Biergarten more so for the atmosphere. Good luck making a decision!
I've never eaten at Raglan Road, but I'm dying to. I've heard such outstanding things about it that there just is no way it can live up to it's reputation. But I just need to try it.
We've eaten at Biergarten, and there wasn't a single one of us who didn't absolutely love it.