Typically I play 2,000 pt games with my friends, since a couple own Superheavies and it's hard to fit them in in 1,500 pts. 2,000 pts also seems about right for typical 4 foot x 6 foot table size.
Sometimes we will play 1,500 pts for a smaller, quicker game. I have also played 1,000 pts a couple of times. I almost never play anything below 1,000 pts, though once or twice I have played small games just for fun or to try out the new rules.