I´m not sure which one would be better medvedtrader or sierrachart. When using IB´s datafeed SC might be a little bit more expensive ($ 35 for service package 6). For using an extra datafeed in Medvedtrader you have the option to subscribe to quotemedia (historical tick data for $28) or to SC´s realtime data which cost $35 extra +$ 10.5 for exchanges.
One of our sponsors here at ET that provides a comprehensive front end to IB is called Motivewave. They offer a 14-day free trial as well.