Always wished they had went with this one for the NX-01...
Had they gone with this design, then I suspect right now we'd have people complaining that they were just lazy and didn't come up with something more original.
And I would agree with that complaint. I do believe the starship illustrated above is very nice looking, but ultimately too sleek and on par with TNG (as opposed to a precurser to TOS).
I always thought it would have been neat if they had actually gone with more of an arrowhead design to the main body of the NX-01. My reasoning being that the starship's design would allude to the future insignia as paying homage to that first wave of Starfleet explorers.
Oh well, water under the bridge.