Long story short, i've been trading for 12 years, mostly hand/eye but always with the goal of automation/black box. Paid a ton; professionally coded box is now ours, source code plus addons, as needed...Most external data comes from simply written C#, perl scripts or excel vba macros; nothing too complex. Question: in an ideal world, this application is hosted on a dual server config, one simply processing data, the other handling trading algos/etc. But before I ship the servers, (there are two companies in mind right now but I want honest opinions first) Where will i be able to do the most strategy testing and API access in live via front end simple code (almost like a TradeStation EZ Language only actual code) before i sign on with them on some type of more committed and potentially longer term agreement. Thanks in advance for any advice.