I must agree that the obelisk needs a powerboost. Personally, a quiker rate of fire would be nice since it has no specialized anti infantery weapon.

Since GDI mammoth tank costs 1500, Nod could get two light tanks or two flame tanks (or a mix of them) for almost the same price(1600).
Flame tanks does very much damage to armor as mentioned before and light tanks often move to quikly for the mammoth, at least in numbers.
Stealth tanks are also perfect in my oppinion, as the have a fine balance between advantges/price/disadvantages.

Personally, I like C4'ing (if thats a word ) mammoths, as they have a tendancy to concentrate on armor

[ February 18, 2002: Message edited by: [NAF]Toxin Soldier ]