I just put 60# injectors on my car but haven't run it yet (got an Extender for the street and Turbotweak for the strip). Since I don't have any experience with them yet, I voted 50# injectors since that what the 60s are replacing.
The 50# idled like stock with the Extender, Lubrant and Testa chips. Drivability was not noticably different than stock - no tip in stumble, no hunting idle, etc. I did have a couple of issues with the car stalling when quickly coming off the gas at highway speeds but I don't think it's chip related.
Right now the 50# injectors have the most options (among those listed in the poll) with regard to chips but I'm sure the 60s will catch up in popularity as more people begin to use them.
As someone else pointed out, the 57s require an ECM mod so it's not really an apples to apples comparison with the 50s and 60s.
Jim