20531 stock market simulator game

Looking to create a stock market simulator. I am looking into various sources for the market data, which will include all U.S. markets... I know a simple application can be set up easily, but the challenge will be to include the functionality items listed below... Trading functionality must include... Long and short equity positions Long options positions Market, limit, stop order types (for equities) Margin functionality Accounting for stock splits Accounting for dividends Ability to place to trades after hours to be filled on the next business day Screen for a summary of trade history Symbol lookup and general research information Also, General functionality must include... user registration, ability to keep ranking, form groups easy backup of data Each user should have nice visual display of their portfolio, and the ability to see history of their trades. An administrative page where an authorizer can edit the accounts of any user automatically. Comments inserted throughout the code are necessary as well to allow for editing.. If you already have a simulator that you could start with, please provide an example, as this would be important to me selecting. Would like to keep programmer(s) on board after initial design for tweaks, for a reasonable monthly fee, but this is not absolutely necessary. Timing is flexible, willing to wait for a quality product, but not longer than 90 days. Thank you