Maybe some aluminum parts?
No, never, not advisable...in that order!
If you're looking to waste money, buy aluminum! Aluminum bends, but unlike plastic, it will not flex back and costs twice as much, my man!
Best advice, to toughen the rig up, is RPM or Tekno RC arms and hub carriers. I personally have RPM on all four corners of my Revo, haven't broken an arm yet. I'm just waiting for a good excuse to get the RPM hub carriers as well, but frankly, the stockers are working just fine.
If you're looking for speed, I'm not sure the chassis is where you'll find it. I can't really comment on the CF chassis, other than it can get pretty expensive. I'd try different gearing before plunking a lot of money on a CF chassis. If you have the stock pipe on the engine, try either a Trinity or Traxxas Resonator pipe to wake that engine up a bit!
Check out the Revo Resources forum for some ideas on speeding that sucker up, but whatever you do, STAY AWAY FROM THE ALUMINUM (at least for arms and hub carriers).