My favourite amp models are Fender Baseman Normal (Tweed B-Man Normal), Fender Twin Reverb (Blackface Double Normal), Mesa-Boogie Dual Rectifier (Tread plate), Soldano 100 Clean, Vox AC-30.
From the HD Fully loaded bundle, I really enjoy the following: Remastered Marshall JCM800, Orange OR80, and Roland JC-120.