I have Raymarine C-120 with radar, depth, gps and auto pilot. There are lots of folks who have more experience with this than I do but you asked for opinions so here's my $0.02. First, whichever system, I would get AIS unless you are never on a navigable water way with anything bigger than you are. Second, I have a C- series. I can update, but not upgrade, I'd go with the E series. Third, I have a 120. I'd figure a way to get the acerage. By the time you run chart and radar overlay, depth and separate radar, each will be down to your 5" screen. I'm not that tall, and it's in a CD-22 Cruiser, I can see out the front window fairly well. I can see what's on the screen real well. Sometimes I even sit on a pillow. Platinum will give the video option, faster redraw, brighter screen, and video input, and photo options. I have the 2kw radar, it's OK, but I'd go the 4 if it had not already been set up before I bought the boat.
These are not just upgrades for bigger is better. These are devices that you are banking your life on, and at some point, may save your life, either from getting lost, getting run over or running over someone.
Break out the plastic, and go for it. You will not regret having an adequately enhanced helm station.
Harvey
SleepyC :moon