Howdy! You’ve described a very broad array of things you would be interested in, so I’ll list vehicles I have personal experience with as well as one for each that I don’t have, most people think are fun/good. You’ve said you’re interested in WW2 era stuff so I’ll also try to keep these around that ERA/BR range. I’m also going to skip nations or individual TT’s if I haven’t played them, but you shouldn’t exclude them when you choose; I just haven’t time or money to grind them yet.
US air-
XP-55
P-47M (If it’s available)
P-51D-10 (If it’s available)
Ger air-
Ta-154
Do-335B-2
Ju-288 (Don’t have it but I’ve heard it’s damn fun and a great grinder)
USSR air (I don’t actually have too many that are for sale for GE, but the ones I recommend I have played other variants of them)-
P-40E
P-47
Yak-3
GB air-
Hellcat Mk2
Mustang Mk 1A
Hornet Mk1 (I hear this is really fun and good)
Mb5 (I really want this one but haven’t the money for it)
They also didn’t pin the report on how rewards are actually calculated, and I find myself repeatedly linking to it in various threads and subreddit posts. I presume reasoning is the same: knowing when sales are makes people more responsible spenders, and knowing what goes into your rewards makes you more efficient at grinding.
For what it’s worth, the /r/warthunder sub has this linked in its sidebar.
It’s updated for Storm Warning, Hornet’s Sting, and some of the BR changes that have happened. Next time I update this, it’s definitely getting split into 2 parts because I am 800 characters away from the character limit.