I use Roundhouses to the sides and to the head. Sometimes, I'll knock their guard out of the way with a Hook kick, and go back for a Roundhouse to the ribs or head. I do this usually only when I need an edge against my opponent--especially when they're a higher ranking black belt.
Kicks I use...
Roundhouse, hook, front, and combinations; as many as five alternating combinations before I start to lose balance.
Supporting Sanchin31 as he says "Nuts to cancer"