First off don't use a roc unless it's nice and beat and preferably light weight, it's simply too overstable, second I wouldn't recommend the aero because it's a putter and I think they're actually harder to drive far for new players. Look into getting some good lightweight plastic if you can, my favorite loaner disc for a long time was a seasoned 150 champion eagle, it went far and wasn't so understable that they could get a way with super hyzer flipping the disc. I would probable cast my vote for the discraft stratus, but a 150 valk or eagle might not be a bad choice either.