Ok, well went through the list and someone already listed my favorite planes, The A-12, YF-12 (of which I have an actual blueprint sheet from) and the
SR-71. However, there is one I didn't see listed the Grumman X-29. Too bad only two were ever built. IMHO one very graceful plane.
Here it is, enjoy :
Some background info:
en.wikipedia.org...
Grumman X-29
Second Vid