Make sure to investigate the firm and, in particular, their enforcement of non-competes before you join to ensure you are comfortable with their terms. One of the three in your bullet (1) has a long history of enforcing (and backing up with Full Legal Might) an 18-month non-compete on even somewhat competent developers and traders.
Or an effective lifetime non-compete if you're talking about Renaissance. Then again, their flagship fund, which is now only open to employees, regularly beats 50% annualised returns after fees.
