Helix or Progasm (Jr) as first Aneros?

I’ve been wanting to get an Aneros ever since the before the Helix was released, and now that they’re more affordable I’m going to finally make the purchase. However, with all the models available now, I’m having some trouble deciding which to go for. I’m not new to anal play by any means, and definitely enjoy a “full” feeling down below, so I’ve been considering buying the Progasm however, since I’m new to Aneros devices/prostate massage, I’ve been recently eyeing the Helix more and more. There’s also the Progasm Jr now, and I’m unsure what the size difference between that and the Helix is. I’m only 5’7 if that has any importance. Anyone have any recommendations on which model to purchase?