There are websites such as "myride.com" and carfax.com along with some others that are easily found on the internet that lists a vehicles history that includes envolved in an accident, had major repairs, etc.

The site you used, Autotrade.com, has carfax.com listed under its used care section. Why would you not take advantage of this to get the cars history before you purchased it? Especially if it was being sold "as is"?
It would have been much cheaper than what you are out now.