Best aneros for piv sex?

Hello keepers of aneros, I would like to acquire one myself, but I have no idea which one to get, and I’ve been reading posts here about maximus, progasm, progasm jr, and still cannot do a decision. I have experience with anal play, I have a 10inch 4″ dildo that I can easily take, but I would like to have prostate stimulation while having sex with my girlfriend. So my question is which model is perfect for this? Because I read that with progasm you might loose the erection just because of the size, and movement might be uncomfortable, but how about other models? I’d like to add just a bit of spice of pleasure but not take over the show when having sex.