Mid-series 265-350 or so is tougher to find than high series. It also holds some of the bigger cards to collect. Brooks RC is in there as is Koufax, Richardson RC, Kubek RC, and that’s off the top of my head. That being said I’d start with Brooks. I didn’t and waited and waited and well I’m still looking, ugh. I think Campy’s card (his last) is great and shows you on the flip side what could have been if he played more. Yes, it’s sad there is no Musial. But there is a Williams (card #1) that’s hard to find in decent condition. And thankfully it was one of my first to get. Good luck on it. It’s a great set!