sded has some good points though.

Just off hand I would think that if the rest of your system ( auto pilot, wind instruments, etc. ) is Raymarine go with the C-series. If not, explore your other options.

We purchased a C-120 when they first came out. Like it a lot. The original C-series is getting a bit long in the tooth though. The wide screen looks good and has some added features. The extra money would be forgotten in a couple of years.