i love the wristlocks..especially Nikkyo,and kote gaeshi, and i like throws, my favorite has to be Irimi Nage
I said throws locks and takedowns, but it's really escaping from locks that I enjoy, although I also love different takedowns Throws aren't really a big part of TKD
For pure spectacle, I'd say ganseki otoshi: daito/aikido version (could be called other stuff..basically grab back of collar, load up partner's spine on shoulders, stand up and throw). OTher than that, I'd say double leg takedown...when it catches the other guy off guard.
My combo i wish i could try using: jab jab, straight, hook, clinch, knee, knee, knee, push kick, jump reverse side kick! High roundhouse! FINISH HIM! Tornado kick!