It seems to me that, when you get to the point where you'd be switching between gasses during a dive, a Suunto Vytec would probably not be the ideal computer for you anyway.
What it tells me is, don't bother with the Vytec, get the Vyper. If one day I do start switching between gasses, I'd probably want to get a computer that can deal with Trimix as well.
Sounds like a plan.
I'v used a cobra for years of rec. diving. I'v used it for a few years in gauge mode as a backup BT for the deco plans that were cut using V-planer. I recently upgraded to an X1. That should last me until I'm too old & useless to play anymore.