Do you have a volume of paint that you are interested in shooting?
Many of the new semis are pretty efficient, and if you run light or shoot a pump later, a 45/4500 is nice to have. 68s are fine if you need the volume for number of rounds / efficiency or poor fills (3k). If you don't need the volume, the 45 is nice for lighter play.
__________________ My Feedback
some things are stickier than others