I have to agree with you, a straight edged blade is ideal for so many tasks. Be it Wharncliff, sheepsfoot, lambsfoot, etc, that class takes my top pick. After that, a basic drop point or clip point is easy to find and works very well. I have to admit that the 'Razel' shape from Graham knives is growing on me really fast, too, though.
In certain specific situations, I like other blade styles, but not as much for general use. For example, recurve blades are great for some applications, but more difficult to sharpen. There are also some blades that I've just never been a fan of. . . like "tactical" tantos. They tend to be too heavy, too thick, and seriously ugly. ;-)