If I ever had to play a bare bones client but had the option of having just a few mods and only a few, these would be my go to's...
AwfulTanker's Serverside crosshair
Once upon a time, there was an undocumented feature in the client. One would hit the "zero" key to enable the server side crosshair. It would work along with the client side crosshair. You would see both at the same time.
Later, Wargaming thought it would be nice to add it to the settings window. When they did this, the behavior changed. Now you can only see one or the other. Not both. And that sucks. This will return you back to the golden age.
(Originally Zuamgua's but now Tomsa's/Jackhammer style):
..or my own when I make them. "SmashemGuaJackOmsa" is what I call them. I'll provide a link when I make a set for this patch soon.
(Max Farplane type mod):
I find the extra fog a little annoying. When I first started playing, my system was not very powerful. This helped. I am much more used to no fog than with. This does a better job than turning everything off in the client settings.
This one does the trick. worldof-tanks.com/mav-s-ultra-fog-remover-for-wot-9-3/
If you use TeamSpeak3, this is a must. - Tessu Mod
More to come...