Shearwater or Liquivision. Something with an OLED display and a standard algorithm, such as Buhlmann GF or VPM.
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Shearwater is really nice. I almost got on in the past. But it's really overkill for the wimpy diving I do these days.If you have a use for a Shearwater then it really is an incredible computer. If not doing significant deco then it's more than you need.