That price would be reasonable if the car has never been hit/painted/etc. If the performance parts can be returned to stock (when it is sale time for you) that would be a big plus. Since it already has the mods that may save you significant cash doing them yourself but on the open market stuff like that usually deducts value. That is not to say it may not be right down your alley.
Hope this helps...Lee
PS To keep the correct rolling radius the tires should be 245/45/17 as 235/45/17 is too short.