Hmmm... I would go with 2.3- because, I think you'd end up keeping 1.2, teeeheee.
And also, to allow yourself a better picking.
Eventually, what sells a snake is its' good looks- and these are dwarf boas... even the females are very very handable.
Female 1 and 2 most definitely, 3 is the followup, I feel.
On the male front...
4 has the best color, followed by 3 who has a slight temper...(but it's all nonsense at this stage) and... 5, if the lack of pattern on his back holds any appeal.
Those, I think, are the highlights of them.