For me, I'd grab my Regulator bowie if I was limited to one. I wouldn't breach a door with my knives, especially if I only had one. There is always something laying around that could perform a task like that.
For front door entry there are firearms and prybars. For everything else, there's the Regulator. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
