Help choosing maps for new Garmin

[ccm]

It's time to replace my old Garmin 192C and I have about decided on either the Garmin EchoMap 70dv or 70s. I need some experienced input on the best maps for the types of fishing I do. 75% of my fishing is in the Louisiana marshes where we fish in waters 2 to 3' deep and run in waters that seldom are deeper than 20'. The other 25% of my fishing is freshwater fishing for crappie in inland lakes. Depths seldom are over 40'.

The two Garmin units come with one of the following:
World Wide Base Map
Lake View HD
Blue Chart g2 Coastal Mapping

I would first like to know which of these three maps you think would be my best bet then I would like your advice on choosing another map to add to this unit. The maps that I have on my present unit are the US Topo maps plus the World Wide Base Map (I think). Both of these maps suck so I am hoping that the current maps are of a better quality than the ones that I purchased in 2006.

Any input you can offer will be greatly appreciated.

Charlie