I'd say you need to ask yourself(-ves) if your machine will work well as a rambot. Does it have the power and the shape to push other robots around? If it does, perhaps sticking with it and making it indestructible is the way to go (then enter full combat FW events, in my opinion a greater learning experience than the HW events), or if you feel that push alone isn't going to get you far then perhaps look into a weapon of some sort. An electric lifter is a common starting weapon, which is what we did and many others have done. Designed properly they can give you the upper hand. The key to rambots is getting underneath your opponents and raising their wheels, defeating their drive and even if your drive isn't particularly meaty, you can do the job of showing them the bottom of the pit. With enough power in your drive, a lifter isn't necessary, which classics like Tornado and Storm II proved, and nowadays feathers like Satanix and Tiny Toon demonstrate.