If you are going to sailing without a watch crew of more than two in fog country -- then I'm a proponent for having a display at the helm. (Going down below isn't really practical; neither is screaming to and from the nav station.)

We had a prior Furuno unit with a repeater at the helm; now we have Furuno 3D with MFD at both the nav station and helm. I think that Furuno is the standard by which all others are generally measured. Look at the work boats. I'd stay away from Simrad, would consider Raymarine.