BIGGEST vouch for rsknight. I purchased some rsgp from them and had a fantastic experience. I have purchased gold thru sythe over 50 times since 2007. This was by far the best experience I have had. The process was easy and they walked me through step by step. They also kept in contact and replied very timely through live chat.
I will DEFINITELY be coming back to them for future gp needs.
The customer service is what will bring me back, the great prices is just the cherry on top!
PS - Thank you Matt with live support for being so kind and easy to work with.