It depends on what type of converter you get. If you get a "tight" converter you can get away with a higher stall. If you get a "loose" converter you probably want to go with a slightly lower stall. Generally speaking, smaller diameter converters tend to be looser but stall ratio also figures into the equation, and helps determine the shift extensions (how much the rpms drop between shifts).
First and foremost, do your homework before you decide what to go with. You don't want to make the wrong decision and have to live with something you regret. Don't forget you should also figure on tuning the shifting to your liking so it's not just buy a converter, drop it in, and run with it. I would recommend you try to find someone with a Charger with a converter in the ranges you are considering and try to drive them, or at least go for a ride so you can see how they perform.
I have a Yank TT2600 in my Magnacharged Avalanche; stock stall is 1600. It's also a slightly smaller diameter than the stock converter (10-1/2" vs 12" if I remember correctly - it's been about 8 years since I did the stall). I don't hammer the truck all the time so I went with a single disc converter. I could have chosen to go with a triple disc, which would hold up to abuse better, and would also allow you to lock the converter while shifting. Hope this helps......