There are a couple more big buggers that still haven't been mentioned:
NGC 1365 (Fornax) & NGC 4038/4039 (Corvus).
1365 is a large barred spiral, and 4038/9 is a pair of interacting galaxies whose tidally affected arms are observable, larger scopes though for the arms. The later is near M104, the Sombrero, which DOESN'T qualify for this thread,
, does it Eric,
, and a prime sucker for the picking this autumn.