My first choice would be an original Mission. I have the 2.0 and really like it, but I was torn between the two, but could only get one. I see that a lot of people throwing the original just love the predictability and versatility of that ball.
The second ball would be a World Beater or a Ranson, two more balls that I've heard good things about but again, can't afford right now.
I know it sounds like I'm in denial, but I'm not.