And though everyone is looking for the firms that give out crazy leverage, one very important thing if you need to leave more capital in the account is to make sure that the risk management of the firm is good. This may sound simple but solid firm risk controls for all accounts will only help protect everyone at the firm.
If you are new at a firm or the firm delays payments to the traders for any reason, the smallest amount possible to achieve your BP needs. If your firm is always on time paying there traders and you have been then for many years, it isn't too much of an issue.
Aren't prop traders considered "professional traders" and can professional traders have retail accounts? Could you use the retail accounts data feed to avoid paying professional data fees?