Hi Joey,
Yours chars are 250? 
Play what you like....... but strongest? I gues any class can be strong and feel overpowerd with the right equipements.
But the ones that do the most damage (if they hit) would definitely be axe champions or cannon bourgs.
(Mages,raiders,scouts are currently being played alot, have good survivability and deal good damage)
Let me remind you that if u want to be strong you sacrifice survivability, especially if you pick a class thats not going to base its survivability of dodge or capped physical defence/magic defence rating with a rediculious HP pool.
To be honnest you cant realy buy your way to the top anymore or be the strongest (to a certain degree), you have to invest time into building it properly with the use of PvP/PvM armors/weapons and runes.
If you do want to buy the highest armor then...
dunno +20 exalted is currently 40b-50b+? atleast.....
(But thats the highest armor you can buy, and not the best choice for every class)
Weapon +20 avarage 30b depeding on the durability etc etc and what class you choose.
Passives, join a clan with all those maxed for additional +10 of every stats and +10% PvP/PvM offensive and defence resistance.
For all other passives % you can either spend alot of time farming them with the use of valor and honor (Need to do both or convert one for the other)
Or... buy them from the IM or players (Currently discounted by 50% due to christmas sales)
And then ofcourse there is the Akram king/queen set for additional 5%'s currently costing around 90b.
If you find a ancient plate armor let me know ill buy it from you if u need more zulie to fund 
Also your sigs are disturbing 
Edited by Cortiz, 21 December 2017 - 01:52 PM.