need help to choose my next tech tree line for wot

my play style is aggressive & mobile, and im looking for more tanks of that kind ( i play tier 9 mostly)
basiclly i wanted to show a bit about my play style so you guys can help me decide.
1)tanks i play well in and have fun: cent 1/7, t-10,IS-2-II.
2)tanks i love but are to much work: standard b, t54e1, B-C 25 T AP.
3)tanks im good with but dont enjoy as much: emil II, obj 257, obj 705
basicly i have the most fun in med mobility/armor/dps tanks
the more mobile/dps tanks I'm the best in when i play with discipline, but most of the time i just want to chill and die cus i wasn't paying attention and overextended.
now the heavy armored tanks im really good with, but there just not as flexible and i dont enjoy them as much.
so after all that, do you guys have an idea for a new branch to farm for?