Carbon forks are nice but don't expect big changes in steering if the axle stays in the same place relative to the fork you have. Lighter steering is a function of the front wheel and headset components as well as the fork design. If your current fork is raked and a new carbon fork is straight then you'll notice quicker steering but it won't be due to the fork material but rather it's because you've brought the axle position in line with the axis of steering rotation. Carbon has some benefits but carbon in itself won't be a hugely noticeable change and for the money you might be further ahead with an aluminum fork if you just want to save weight.