Plain old Realm, no suffix. I don't remember if I tried the SR6 or SS (I'm pretty sure I tried one, if not both, of them), but the plain old Realm seemed to feel the best to me. Shop had me try a bunch of different bows. Of the ones I remember trying...
Mathews Vertix
Hoyt Helix I think?
Elite Ritual 30
Aforementioned Bowtech Realms
Fact of the matter is, because of my little T.Rex arms, no bow I buy is going to be super fast. And I'm OK with that. I'd rather get something that feels comfortable for me to shoot. My chrono says, at 25.5" draw, 65 lbs, comfort setting, 405gr total weight arrows = 240FPS.
Caveat of above opinions being that I consider myself a new archer.