trusted users on sythe.
Cheaper than other sites, and you're dealing directly with the seller.
If you're buying gold with PP it's very hard to actually lose your money, even if you don't receive the gold, you can use the charge-back feature.
Player auctions is one of the best gold websites, but I would rather use Sythe. Gold4rs and USfine have really bad service, I would never trust them with any money or use them to buy gold.