I believe its bots actions + unrealistic time played that leads to ban.
Therefore with a good script (priv perhaps) and a good amount of realistic breaks, I am quite sure it will last for good.
http://pcpartpicker.com/p/pNHyD3
$1200/- at the moment. $2k is not necessary even for professional use.
- Did not include keyboard, mouse ( Own preference )
Feel free to ask me anything.