Wonder if i could get a D2 (because it looks best) and flash the quatix firmware

Yes there are much more features in the fenix than in the quatix. But some features as the COG and SOG are the most usefull and not there in the fenix i think.
Anyway, it would be a great thing of garmin if they give all watches all features and the same Firmware.
They would sell more and the user could decide which look he prefers.