if you think strictly on canon tracked designs 35 tons or under, you actually have few alternatives: Heavy APCs (transports with limited firepower), the Scorpions, the Galleon (fast but badly armed and armored), the Hunter (fast and useful but expensive missile boat) and the extinct Main Gauche. On a limited budget, a combination of different variants of the Scorpion and Heavy APCs carrying infantry can be annoying in a low BV encounter and playing defensive roles.
Keeping the budget low but more flexible you can combine it with other cheap vehicles: Warrior VTOLs, Saladin/Scimitar/Saracen hovercrafts, Strikers and Hetzers.
I have tried a combination of Warrior 7As, Hetzer (std) and Hetzer (SRM) with good results. The Hetzer ambushes and the Warrior flanks. You may add some Scorpions to this formation.