How I have missed diving forums...
OC only would be ok if the price was right, don't really want a HELO2 though so probably OC and CCR. That VR2 sounds tempting though...
Learn ratio deco and spend the money you would have spent on a computer on helium instead?
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Have you thought about a pony, that way you can just skip dive planning altogether
Don't discount the vr lot. They've brought more divers back from more extreme dives than the rest put together. The only reason I went ostc is I couldn't read the sodding display. Cheap way into trimix computers.
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As others have said, I wouldn't discount an old VR computer as they can be picked up pretty cheaply these days. The old VR3 is a robust workhorse of a computer even if is a bit of a brick! The best option would be an LCD VRx - don't go for the oLED version as it was crap.