Biggamer
I would honestly go with the Scharn. She's pretty good at "credit printing". If you like DD's, you may actually enjoy Scharn.
Maverick
CV's are actually a bit tough to do properly, though if you are doing well with them, more power to ya.
I'm not overly good with them, though I must admit that I do enjoy the USN line a touch better than the IJN line simply because I don't have to deal with as many squadrons in any given setup.
I'll stick to Co-Op with them for the time being. BB's require accuracy and patience. Don't be afraid to brawl with them though, especially with something like the Bismarck. Just got to plan your moves well in advance, or you'll find yourself having a very nice bowl of torpedo soup.
As of right now, I'm sitting on 101 ships.
Zao was my 3rd T10 that I picked up the day before yesterday, and I'm really loving her. It was a tough call for me, as I could either: A) Pick up Montana; B) Pick up Fletcher; C) Pick up New Orleans; D) Pick up Zao. Seeing as my then 2 T10's were IJN (Yamato and Shimakaze), I figured I push for a 3rd.
Next T10 however WILL be Montana.