I second Ray's vote. I carry a Vindicator daily and love it mainly for how wide of a blade it has. Among other reasons are the blade shape of a recurve Bowie, perfect size (although it is a little longer than 3.5) and it carries well in pocket. It is a very stout knife for sure and has a gorgeous aggressive style that works well as an edc or defensive carry.
If you want really wide in all aspects get a Big Bulldog. That thing is a beast of a knife. Probably the sturdiest, most stout object with an edge I've handled. Every time I played with mine I felt like I was holding a pocket battering ram.