I think that StefyZZ textures and models are the best by far, specially the new ones. But they are expensive(the work is excellent, supreme quality, so I think that is worthy!). I did two renderings in my gallery with them (saur's gallery here). Byme Me Ok also has very good photorealistic textures with very good prices. You can see the product in the Market Place her. They are many others are are very good but these two are my favorites. Check!