I have S (154 cft) tanks right now and am running a mirage but so far mostly on the Lynx centerfire. The Lynx does use quite a bit of oxygen relative to the others you mentioned. I do not want to be limited by purity or the amount of oxygen available for combustion so I will not use concentrators unless forced. The S tank lasts 10-12 hours and costs me $18 to fill. I typically go through one tank a week. Since I upgraded to the mirage I will be upgrading to K (250 cfm) tanks. My supplier will fill them for $21. What are you planning no making? For solid work larger than beads I would suggest the Lynx.
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