Would be cool to have a game with you and Stark again
If your rank and load out is at the level where you can take on level 30 elites OK then I would suggest the daily missions on Hard.
That will give you 15 PC for the daily, and around 3-5 for killing the end boss so 36 PC per day roughly just for the hards solo
In addition to that, Lexington on challenging is a good way also - 30 PC plus a few extra at the end for the boss and if you get a decent team, shouldn't take more than 15 minutes to run through start to finish
So for those three you would be looking at 60-70PC for less than an hour of gameplay, which is what I plan to do tonight for a few hours