You might want to check with your state laws first since some states will not allow a salvaged title car to be registered on the road unless the repairs were made by licensed shop approved to do that kind of work. Also, the damage to the front of the car does not appear to be so bad as to warrant a salavaged title...so it may have already been brought back from the dead before the last accident?
I don't know how long the current owner had the vehicle, but if he owned it, but it seems odd that nobody had fixed the minor front-end damage? I am suspicious that there may be a lot more damage than appears in the photo, possibly from a prior accident, flood, or something?
I assume you cannot drive the vehicle, but that is the only way you can tell if it is mechanicly sound.
$900 is a great price if the damage in the photo is all that is wrong...I'm just a bit suspicious.
...Rich