"Kurita Combine-Arms" is kind of an oxymoron, akin to "Clan strategy" and "Taurian sensibility", but I understand you are looking at putting a force of Kurita 'Mechs on the table with another force of Kurita vehicles and/or infantry.
Most of the effective Drac vehicles tend to be of the fast & expendable variety. The J.Edgar and Pegaus are popular, along with the Azami trio of Saladin, Saracen and Scimitar. Depending on the era of play, you could toss in the Yasha VTOL as well.
Most of their heavier designs are effective, if not particularly appealing. The Tokugawa is solid, if unimpressive. The Schiltron can be an excellent support platfrom, but isn't much of a direct combatant. Perhaps the best Drac tracked vehicle, outside the generic Demolishers and Behemoths, is the simple Bulldog medium tank. It's moderately fast, has a weapon for every occasion, and whips the pants off the Vedettes & Pos that everyone else use.
My only other suggestion is to not discount the value of the Kanazuchi. While it's no Grenadier, for one of the first generation of Battle Armor, four medium lasers with significant armor is nothing to sneeze at in a defensive position.
