the range in charges for x-trader varies not by broker or firm (unless they up charge you), but by the number of markets viewable at one time. If you have two markets, it's around 950, just one 650. With x-trader pro, you get four markets, the auto-spreader and auto-trader. the pro version costs 1450. Some firms will pick up the cost. . . . .if you do *lots* of r/t's.
for the professional futures trader, it's hand's down the best platform out there.
for the more "retail" sort of person, TT is coming out with a "lite" version in the next couple of months. Supposedly it will be just as fast, but without as much of the functionality.