Data CQG is extremely quick, that said I do not use it you can just as easily scalp with Seirra Chart for $26 a month compared to up to $2000 I am a huge fan of button Trader which comes with many strategies (scalping included) and you can also design own strategies. I believe buttontraders flexibility and ease of use made me a better trader.
TT for front end,good broker try Advantage futures. I hear good things about Futures Path also.They have thier own front end they call Photon Trader, it is also very good. TT is very expensive though.