I only got this last week. I am debating whether to buy a vulture outright or trade my cobra in as well.
The only thing that is bothering me is the fact that if you have more than one ship, you have to trek back to the station you swapped ships at to swap over.
Be good if you could pay the AI to fly your ships from station to station to avoid this.
Obviously they wouldn't fly it out, it would just be a delivery charge and it would appear iat your current station after the appropriate one way travel time.
I personally don't see the reason to store a ship.
If you sell it (especially a Cobra as it is fairly cheap) it is only a 10% deduction on the hull price. I de-equip before selling the hull (equipment sells for the retail price) and there seem's to be most ships and most shipyard stations. (Vulture can be a bit of nightmare)
So I would do that. if you need to downgrade for cargo/exploration you can just buy a new ship and re equip.