Some bad reports of Just2Trade here, including open orders randomly being canceled, and wrong cash balances and other account balance discrepancies: http://www.brokerage-review.com/compare/ameritrade-vs-just2trade-review.aspx
I will say, Scottrade's customer service has always been phenomenal, whether I call, email, or stop by an office.
Oh, another requirement I have is free withdrawals. It's fine if it's a check they have to mail to me.
According to this site, Sogotrade execustions are slow and "sometimes take minutes." http://www.brokerage-review.com/stock-broker-reviews/sogotrade-review.aspx
All these cheaper commission brokerages sound shady as heck. OptionsHouse seems to be the only non-shady one.
Also, OptionsHouse is out if you trade penny stocks. In addition to the regular commission they charge $0.005 per share for stocks under $2. The rest just add 0.5% of the principal. I couldn't find any info for Just2Trade about penny stocks.
OptionsXpress (now part of Schwab) is a decent home for long-term capital appreciation accounts like retirement money. In my experience, they'll match Scottrade at $6.95 for most stock txns and $10/side for 10 options contracts. I still keep some money there (IRAs), mostly for broker diversification but also because of inertia - the accounts are not that active and it's not worth the hassle to switch to save a few bucks. If you're dead set on leaving Scottrade, OX often runs promos for commission free trades for the first 60-180 days. Just need to catch them when they're hungry.