If it is within the original poster's skill set to re-bend, why not? I've shown two working examples that it CAN be done at home, with old cruddy track too.
If money is no object, working on things a PITA, and succeeding brings no pride or joy, then by all means buy new. New track is awesomely smooth and consistent (for a while at the very least)
Worst case the o.p. would have to buy more track to expand again. Dollars aside, the learning opportunity alone is worth it imo; even if it's another failed attempt in the end. They now have a loop to run to keep the train busy while fiddling too.
On re-bending near any metal. The action work hardens the metal, cracking once abused enough. With sheet steel, a soldering gun can often heat the metal enough to soften it, making a break less likely. I used to use a micro torch till Roy Boy (I think) pointed out the flameless method.
