Getting the serpent ready for use is what you want. You can always upgrade the paint job. What do you want to add?
Regarding Conquest: I would buy 2 of the first one I would see in a shop. I can't see them expanding beyond Spain yet. I have no need for the miniatures but the paint makes it interesting. Black is always good.
Provavly just paint another one haha I have 4 left to paint
They will start in Spain in January. For me, are great because I need 40k scenery, and my brother have Nurgle... the space marines...well, we can use them haha But yes, just for the paint... If I can I will buy more of the 1st one, but all the people wants it!