Karl, depending on the type of fishing you do, the suggestions might change. As always commented by others, go with the largest screen you can afford. Are you looking for one unit, multiple units, linking to trolling motor, etc?
I have been with HB for a long time as I require my electronics including the trolling motor to all be linked together.
In regards to SI, I think the general consensus though is that HB has the best SI currently available.
A really good site to visit for all electronics is http://www.bbcboards.net/forum.php. You can spend days here reading up on the different products.
Thanks for the reply. I fish for Bass and Walleye. It’s obviously very clear to me I can increase success with good electronics. I currently just have an older power drive Minn Kota, which I would like to upgrade next year. At this time I’m looking for one unit knowing that I can always add. I’m also crazy person that will probably end up $10k worth of gear on my 1998 boat the second I find success with increasing my odds.