On the chassis, I’ll just say you can get a smoking deal on 1 or 2 year old equipment right now. Old and worn out is old and worn out.
Unless you’ll be racing in a spec PRD class I’d skip that too. A PRD isn’t competitive in a normal TaG class. So, no, its not a winning combo at the regional level. Maybe club racing in a spec PRD class.
If you’re just getting into TaG and want to race beyond local/club racing, you need to pay attention to what’s happening right now with the TaG class and the engines.