My dad is interested in a 2nd hand NSX now, I think he's longing for the days when his hair wasnt gray, and I wasnt your typical teenage son/moneypit(He had a black 1991 NSX when they first hit the streets).

Any good sites besides NSXPrime, with FAQs and all those goodies

 

Nope. NSXprime is THE place for the NSX FAQ and forums.

However, it's worth checking websites like autotrader.com and cars.com when you're shopping for used NSXs for sale.