I'm fortunate enough to be able to carry pretty much whatever I want without it ever drawing comment. Us Southerners don't get excited about seeing a knife on someone's belt. I carry a fixed blade about 50% of the time or more (100% if you count my neck knife-top knife in my avatar) in place of a folder.
My most often openly carried fixed blade is a Rinaldi Gambit with a 3.4" blade-the bottom knife in my avatar-worn horizontally on the belt. I also frequently carry either a Rinaldi TTKK with a 4.5" blade, or a DDR CF ALB with a 4" blade. Other times it might be a Nimravus I use for a beater, and at work. 4-4.5" is about ideal for an "all-around" knife, IMO, and I have more fixed blades in that size range than any other. Got a couple of 4.5" Busses, but haven't gotten kydex for them, and the supplied sheaths, though fine for the outdoors, don't make for comfortable carry as an EDC, especially when driving, so one of them usually stays in the truck.