You can get even better with the Sabra, which is basically an ugraded Magach-7 with the Merkava's 120mm gun.
Should come in service any time in the Turkish forces if I'm not mistaken, but I couldn't find it in the game (the T-84 Yatagan is pretty funny though!).
Not yet in Israeli service, but I wouldn't bet it will never be...
BTW the ultimate Magach seems to be the -7 Alef, but that depends on which timeframe you're playing. Or is the Gal undertated?
Anyway the Merkava-4 still ranks among the very best tanks in the world IMHO, and that is pretty well pictured in the game.