I just installed a Simrad 4G radar, which was about $1950 and use a PC running OpenCPN as the plotter. It works really nicely in that it has a fast update speed, does MARPA target tracking, integrates AIS from my radio, the charts are downloaded for free and I can use it on a laptop for trip planning. A nice feature of the Smrad 4G is supporting dual ranges -- it acts like two separate radars.
I ran the cable from the radar to a Wi-Fi router, so I can actually get the data on my main plotters (wired) and on a tablet (wireless).
Of course, how much one spends on the computer used as the plotter is a big variable. Mine was expensive because the waterproof outdoor visible touch screen wasn't cheap. An old laptop, if capable enough, is free and useful.
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