I have personally been advised never to buy imports, because they can be stressed out by human contact more than those raised by humans all their lives. (among other mantras, but i won't get into it)
However, as a asnake, BP's tend to be pretty calm. All the "bad" BPs i have known or heard of were imports or neglected animals that were never accustomed to handling when young and as a result were difficult to deal with as adults. (like kids or anything else, get em used to it while their young, lol)
My little male is a CB and great handler, very cautious and used to jump at any percieved threat. now he only shies at half the stuff he used to, hee hee. Other than babies being a bit more nervous than adults, there are generally no problems with the majority of balls i've met or read about on this site tameness -wise.
My advice is to go for an older snake if you can, the males are usually cheaper if you buy, BUT please consider adopting a snake if there is a local rescue or someone advertising for a snake looking for a home. Be aware that secondhand animals can carry risks if the former owner is a not too educated or trustworthy person, but many snakes do need homes and have no problems other than being unwanted.
males tend to be cheaper, but wiegh that against Scitt's info about females, and really as long as you aren't looking to breed, ther prices are fairly reasonable for normals in both sexes if you do buy from a breeder.
hhmoore is pretty dead on with the reasons for being popular. Myself, i love fat chubby snakes, and their cute little snub snouts, i live in a high humidity area, and i fell in love with piedbalds... And i bought a baby because he was cheaper than an adult and it is pretty cool watching them grow up. :3
good luck whatever you do, and just be careful and check out sellers on the BOI when you do get one.
Do you have any plans on where you'll be gtting your new addition from? (f you do end up getting it)