I'm glad to see you are considering TT and wish to remind you that the TT platform you would have access to is the exact same platform used by the leading banks and hedge funds around the world.
Regarding price, our Pro package, with complete algo functionality, is offered at $400 and is capped at $1,800. This includes all market data fees and back end fees. Our standard package, which excludes most automated trading functionality, starts at $50 and is capped at $1,000.
https://www.tradingtechnologies.com/platforms/pricing/