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Aeris NRX1. It's simpler (one button only) and light years ahead. As Tortuga says, they don't make the Mosquito anymore and the Gekko is becoming outdated pretty quickly.
I see from your profile that you are using pretty top end equipment as far as your regs go. That's very wise. Getting the best computer you can is also a wise decision. Good regs and a good computer are your two key life support systems underwater.
Why not go a little more upmarket and look at a D4/D6 if you really like Suunto or an Oceanic Geo/Aeris Manta?
I would to have a computer, Any comment for Suunto Mosquito Vs Gekko
I'd say Mosquito is a Stinger in plastic, Gekko is a Vyper minus PC interface.
Both are nitrox capable, but if you want to download your dive profile, Mosquito is your only choice.