RE: Expandables....Recommend One?
It's not a matter of speed. It's a matter of Kinetic Energy and momentum. For that you need a moderately heavy arrow and decent bow weight. I usually recommend a minimum of 65# depending on the setup.
As for which broadheads. I don't usually recommend certain brands, but I would not shoot any broadhead that the blades "flip" back. The ones that slide back are going to be more reliable in the long run. Snyper, Rage and Tekan are a couple that I'd go with if I shot mechanicals at all. They'll take a little less energy to deploy the blades and reduce the tendency of the arrow to cartwheel on a quartering shot, whic reduces penetration a bunch.
To that end I don't shoot mechanicals due to low bow weight and light arrows that shoot 270 fps. I've never, in 30 years, not been able to get broadheads to fly like field points. Learning how and taking the time to properly tune a bow for broadhead flight is the answer to this. To that end I'm a nitpicker.