Lots of good advice--I also suggest you go to an electronics or West Marine store, and play with the various displays to see what you want.
All of the manufactures have digital/sold state radar. It is great for close up work (which is what most of us want). The power is far less than a magnetron unit. For Garmin it will be the Fantom,(some displays work with the Fantom and some with the HD --magnatron) Ray Marine it is the Quantum 2 plus, The boat I own (ed) came with a fairly new RayMarine MFD, and I added a Quantum radar plus a bundled 7" MFD (all touch) for a little over $2,000, including Navionics charts, wireless radar, (also wireless to I pad from MFD) and down scan chirp, sonar. The other screen already aboard was another 9" which was hybrid, touch screen plus knobs and buttons. (When you are in rough weather, the touch screen is sometimes difficult to use). Also you may want to consider an auto pilot. Raymarine has the cheapest good pilot. Garmin has several, as does the Lowrance/Simrad/B & G line. I agree that Garmin is the easiest to use. They also have purchased Navionics, which many feel is the best charts. Garmin is adding these to their MFD. The 4th is Furuno. I had all Furuno gear for my long range cruising sailboats. It is top of the line but was more geared for the commercial user until relatively recently--they also have a digital radar, with excellent MFD and sounders.
Also consider if you want AIS. If so consider the B + which is closer to the commercial A than the recreational "B". Many of the radios will also read AIS or can send the info to a screen. I had used an out of date 5" MFD for just the AIS read out--that way you don't clutter up the main navigation charts.