LOVE:
C210 - I fly it for work, but it's a great machine. Lots of power and nice and stable.
Citabria - 0-1000' in 3.3 seconds. Plenty of power, aerobatic and a joy to fly with lots of windows to look out of at funny angles. Simple, too.
HATE
C172 - Underpowered, mushy controls, almost all examples old and tired. Too many hours spent doing CPL navs in 'em.
C152 - Anaemic performance, hot and high = burning and death. Cramped as hell when your instructor was 6'2" and 120kg.