Zac on rabbits if you fit a doubler the FOV is very narrow, ok for foxing 100yds and onwards. Thats why leaving it at 6.5x is probably better to get on target, even if the image isn't as good. With the ward you can go from 3x mag find it and then wind the mag upto 16x if you want and take the shot. Having high mags gives better image quality but it becomes a nightmare for finding things, even when using a spotter, etc
Thanks for the feedback IanB, as for the OP - go spend some pennies, I don't think you'll regret it. Happy shooting ?