The Arcam has both phono and digital inputs. Do you need those?
The Rega has Phono only I believe, no digital.
The Vincent is a hybrid design having a tube preamp stage and has digital input which is stated as for CD playback. Not sure the entire meaning of that, other than likely PCM only. I once owned the Vincent SV 226 hybrid and thought it to be great. Wish I never sold it. The SV500 has the lowest wattage rating at 50wpc. AA does have a return policy.
I believe the Music Fidelity is line level only providing neither phono or digital inputs. The price as offered by Upscale makes it a good deal. Seems to be a very robust amp for the price.
It comes down to what features you need and how each best interacts with your speakers to provide the experience you wish for. All are reasonable options.