Looks like you've got a solid system lined up there SH!
When you start talking brands of Marine Electronics, it's helpful to look at networking and expandability.
In other words, if you see something, another feature, function or upgrade that you want in your particular installation, which brand allows you to easily improve or add on?
In my mind, that's a huge advantage with Lowrance/Simrad. In fact, Lowrance has recently come out with a touch screen autopilot and the only module you need to add is a hydraulic pump and control box.
Nothing is more frustrating that making a sizeable investment in your electronics only to turn around and see it become obsolete.
Lowrance is ahead of the curve and is constantly making software updates available on their website to ensure that their equipment is always on the cutting edge while remaining very user friendly.
Good luck with your buying process and if you need any help in spec- ing out a system let me know!