I just received an email from Zecco  that they’ve lowered their minimum balance from $2,500 to $0. I still haven’t opened the account (and provided a review) like I said I would, a bit busy lately with some other projects and haven’t had a chance to dig up the necessary documents, but I still plan on doing it. Those who want to trade on margin, a risky endeavor, will have to have a minimum balance of $2,000.
For comparative purposes, TradeKing  requires no minimum balance, ETrade  requires a minimum balance of $1k, TD Ameritrade requires a balance of $2k, and Charles Schwab requires a balance of $2.5k.
I’m not yet advocating you open a Zecco account, I haven’t myself, but their offering is getting more and more tempting.