I don't playmany post-2000 battles, but my force structure in those I play would be with such points - one btr company, two 3 tank platoons (like t-72BM1 - so the cheap vision 30 types) and artillery battalion (I like arty

). Depending on conditions I may choose rather one 4 high-end tanks with vision 40. I don't like mixing the types.
Arty I choose regarding the type of battle - heavy guns for assault, light field guns for defense.Most cost-effective are usually off-board towed pieces, though sometimes on-board towed arty can act like a magnet for enemy fire and maneuver, which can be suited to your needs (as you have very likely a decisive fire edge over the enemy, who rarely buys so many arty - therefore not much worry about counter bat strikes).
I don't usually buy many mortars (that would be too artillery heavy, once you have a battalion of "trees"

), though they are very effective in defeating infantry.
AOP is a must as well as two or three scouts. Onboard arty also requires armoured ammo trucks.
Cheers,
badger 45