My two favorite too. With geometric you can incorporate some subtle patterns in your shirt. If you had subtle patterns with a geo tie, is it best to leave a plain jacket or suit? Most of the time I would think so.
I'll be perhaps one of the few here to champion the paisley. I love all colors and patterns, but can't handle the theme ties. One of my favorite combos: orange shirt, hot pink geometric tie w/ brown pinstripe suit. Toxic to most but i love it. I also think its pretty hard to beat a dark pinstripe / chalkstripe with a dot tie.