Indeed...my vote would be Chipmunk closely followed by Bonanza, C180s/185s are also VERY near the top of my list piston singles wise. Piston twins...Barons were nicer to fly than most although an argument could be made that there were better twins in payload/range...C404 was a goody.
Turboprops...Twin Otter followed closely by C441...for entirely different reasons. Using a Twotter for what it was designed for..real bush flying, single pilot...is better than sex.
Jets...The F28 was a pilots aeroplane...as was my personal favorite the Falcon 200...as nice to fly but left the F28 in the dust performance wise. The 767 is a very nice machine and compared to anything Airbus make it is a 'pilots aeroplane' but it is really too big with too much inertia to compare to the F28/DA200 in handling terms.