Personally I would like to have them all.
But to chosse only one
I would say the flamed blade, although I like the flamed whip the best after the flamed shield.
Isn't it the easiest to produce the flames on the shield, the whip and the flamed blade all together since they should be out of the same material and half-translucent colour and release the purple scimitar now?
As long as we get everything eventually I do not really mind what comes first, as long as the rest comes still next year!