I have no experience with the Taras or Nics, but here's my input on Hogs:
1) Hogs range from about 4-6' though I have seen females get up to ~7'. I recommend a male Hog just to be safe if size is a concern. Though Hogs are considered a dwarf boa some can still get the same size as Colombians.
2) Depends on the snake. My Hog can be a brat but she's calming down and is actually really good outside her tub. Here's a pic of her on one of those "temperamental" days (though even then she's still handable: she likes to bluff):
Most Hogs have wonderful personalities though. I'd start with a baby that you can grow with.
3) I love my Hog but also love my Colombians, BCL, and Argentines. I would recommend a Hog if that's what you're considering though: JimiSnakes and Chad Duggin work with pure Hogs and I fully recommend each as I've bought from them before. Rio Bravo also works with pure Hogs and though I haven't worked with him he's a trusted name on all things boa.
Here's Attika being less of a drama queen:
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