My mom has a 2005 300C. Never had any problems with it. Bought it new and always takes really good care of all her vehicles, so no big surprise. Lots of power with the 5.7, I’ve never driven an SRT-8.
As with any car, how well it was taken care of is the most important thing. Make sure it comes with service history records.
I would not call the interior of the 300C crap by any means. The base model 300 might not be not as nice, but the C model with leather and other interior accents is very nice.