Looks for B Wilson he has some great pieces (heady-est shit out there) not too expensive but very very well made I have this one and use it regularly. Use a enail for the best of all performance or if that's too expensive get a good this Quartz banger with a correctly fitting carb cap.
You want to heat you piece to about 550-625 let it sit for a few seconds then drop a small dab in as it starts to cool, use the carb cap to maintain the temps, the result is the cleanest tastiest hit you have ever had, once you finish use a Q tip to clean the banger before you heat it again, this keeps from getting residue build up and that burning oil taste and smell.