Serbetli is really good stuff, especially the black flavours they make. As to narghiles I's say that you should try to get a super heavy, all brass, machined rig. They typically are made by small shops and cost a bit more but are worth 10 time what they charge. Usually the glass isn't that great but you can easily get a mail ordered base of excellent quality else where without much work. I'd suggest not bothering with the locally made leather hoses because you can't wash them. Make one from food grade plastic tubing instead.