Cheapest, Yet Speediest BL Combo for the E-Savage?

Hi, need ideas on how to improve the strength of the e-savage drive train before I go stuffing more power into it. The telescopic driveshafts snap with stock motors. How do you guys fix that? I'd like mine to go a bit faster but the weakness of those driveshafts is a prob. I have seen some canadian company doing custom CVD's but that's a real expensive upgrade. Any cheaper solutions out there?