I am interested in knowing opinions and recommendations as to online brokers who handle stocks, options, commodities and futures - any brokers who stand out? What are the particular limitations of Think or Swim (someone recommended to me)? My main focus will be on commodities and futures but I'd like to have on broker who can also handle my swing stock (not day trading) and options trades, too. Thanks.
Penson introducing brokers can offer the full range of what you're requesting. Interactive Brokers of course has equities and some futures, but may not have all the commodities futures you're looking for (?). If you are a somewhat bigger trader, then you can use RedSky/ITG or Newedge, which I think can offer the whole gamut of tradeable instruments.