Lots of good options and recommendations in this post. I have been using IBS's system for the last 4 years and it has never given me an issue to this day. If I was to do do it all over again though I would try the Blue Sea ACR and see how it goes. It doesn't have the in cab display but as mentioned there are other ways around that if you want to check your battery voltage levels.
Like this? I went with the Blue Sea ACR and did my own wiring/fuses etc. I had no idea as to how to do it when I started, but there is plenty of information on this site to get a good system together. With the ACR I never have to worry about the dual battery system again, it's always charging when it needs to and I can run my fridge for almost a of couple days when camping, depending on conditions. Solar is next...