I found Edisons Securities (edisonssecurities.com) from a blog post comparing services and the initial impression was positive. But since the beginning of the year later, I have encountered so many issues that I cannot recommend them. Trades failing, charts not loading, and support tickets going unanswered for days at a time.
Pros: Segregated accounts|Dedicated account manager|Demo account available|Personal attention
Cons: Live chat only during business hours