I'm a Colibri man, all the way, though Newport and Lucienne bench very well as well. I've been picking up from butanesource.com lately, and they have just about every major brand out there. ^^^ enjoyed the last post about hash oil extractions from yester-year. As some other folks said you want to start with at least a 5x refined butane but in the end it's all about the purge... a higher quality butane will boil off 99% at room temp, or a little warmer, but you really need a vacuum purge of some sorts to get the best product. Folks will argue for days over which brand gives you the best flavor/results so I suggest you just try a few different ones and go with what you personally find to be your best.

Happy extractin!