In IL2 I tend to focus on the FW190A and D's of all models (I'm most at home in the A-6 and D-9) as well as the Ta-152H when I'm feeling dangerous. For the Allies, I like the Spitfire VIII, Mustang, Corsair, and Yak-9.
I do fly pretty much everything going....so thats my short list

Pacific Fighters has its problems but if you have FB and AEP already then I would strongly recommend getting PF as well. There's new addons for the merged install option coming that will add some more new eastern front maps (Murmansk and Kurland - Kurland is a FW190 paradise apparently

) and new aircraft for all fronts.
The problems with PF relate to the standalone install and it mostly has to do with content. Although the Pacific theater content is a ton more than came with CFS2 (stock) its just not quite enough or coheisve enough to do everything wanted. That said, the addon (which is free BTW) that is coming is supposed to remedy that to a certain extent. The fact that no carrier torpedo aircraft are flyable at this time is fairly annoying but the fun you get from 3 theaters of operations with new aircraft that can be used in all of them (the A-20 for instance - which IMHO does carry a torpedo) is great.
Consider it....I strongly recommend if you have both FB and AEP (thus allowing you to merge your installation).