Aftermarket items

So, I've hit up Scale Auto with this question in a couple of places, but I thought I'd post it here as well. SO here goes;

I just bought a GTO kit this weekend as my first car in a long, long time. Now, things have changed a lot since I last built a car model, so I wanted to know what kind of AM bits are out there. Specificly, I am looking for modern wheels/rims and tires, interior details and possibly engines and brake kits as well. SO, let's hear from the experts out there, please educate this poor Marine.