My vote is for 65mm Herbie.
If that's too pricey I'd suggest the 40mm or 50mm depending on what exactly your making. They have the same ports just spaced differently. 40mm is denser and 50mm is softer. I use a 40mm and making foot tall pieces isn't really a problem.
ps. If you go herbie don't listen to them and run it at 28psi oxy or whatever they suggest. Crank that bad girl up to 60psi and use the oxygen knob to regulate flow when switching between stages.
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