A 5 lpm uses almost as much power as a 10 lpm so I'd recommend 10 unless you find a great deal on 5's. What torch are you planning on? The 10 lpm, 20 psi concentrators will give you many more options. You can email saltcityglass.com for a quote on a new Devilbiss or get a rebuilt Respironics from them.
Edit: the Devilbiss is ten pounds lighter than all other comparable units so I'm not willing to pay the price to find out how good they are.
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