Thanks Guys, I went over to humminbirds website after Marty mentioned it and yes the Matrix supports all 3 types, no side imaging though :-( . I think I may go with the tri/quad, can you select different view (like turning off the side wide beams)?
Does the display look like a regular fish finder? The pictures on Humminbirds website, for the quad beam, were not very good.
http://www.humminbird.com/productLines_wide.asp?id=794