I set up my 1860 Landau jon for the methods of fishin that I use most often...
This is my spider riggin setup.....
Now, I realize your boat is not as wide as mine and you probably don't have room for 2 people side by side in the front.....but I also have a spider riggin setup where I can fish out the front and my partner can fish out the back...
I sit on the front deck fishin forward and my partner sits in front of the rear bench facing rearward....
For my stationary night fishin I have pedistal bases in the floor so I can move the seats "down into" the boat....I feel it's a little safer sittin lower in the boat when it's dark.....
For castin I sit on the front deck and my partner sits on the rear deck....
Basically I have pedistal bases mounted in several different places so I can move the seats around to accomodate the method of fishin for that day.....
As for your FF question...I like having 2 separate units on my boat so if 1 craps outs in the middle of fishin...I can use the other and keep fishin...
As for your GPS question I like the E-Trex because it's simple...like my brain...