If you have the patience consider not getting self igniting charcoal..use non-self-igniting. There are Greek and Japanese incense charcoals of high quality that have no chemical admixtures. Granted the selflighting is convenient…but at times you can smell the acrid subnote of burning saltpeter as the fragrance of the incense thins out.
Desert Fathers Incense (formerly Black Powder Incense) offers some nice selections of traditional Orthodox incense and censers as well. They also offer liturgical scents in cone and stick incense (high quality) forms such as are common in eastern countries. The cones have a modest burn time and are essentially incense infused charcoal briquettes…light them off, blow them out after a second or two, and they burn on their own.
The stick incense made by Desert Fathers is also incense infused charcoal, except it is rolled on a thin stick and not pressed into a little briquette…so no risk of inferior or suspect materials. It's all premium quality.
The stick and cone forms, if you choose to use them, are probably better suited to the home altar rather than the temple where traditional granular or pellet forms are preferred.
I've not sampled all they have, but in the cone and stick forms I really like the St. Abo, and in traditional granular form I like the Lindisfarne blend. I believe they have just added a richly scented middle eastern rose in honor of the Theotokos…sorry to sound like a commercial, but I do like their offerings.