I have used Garmin Bluecharts on my PC. I like to build routes on the PC and downloaded them to an Etrex Garmin handheld. This all has worked well from my style.
Garmin seems to be eliminating Bluecharts on a CD and going with the SD cards.
What is the best software for a PC to display charts, Marina's etc., build routes, and then down load them to a garmin(With charts)