Yeah, just replacing the front bar with a bigger/stiffer one will make your car's built-in understeer *worse* and you'll be plowing all the time, especially in the rain.
AFAIK, those bars come with rubber bushings- you might want to use some polygraphite ones from Engery Suspension to use instead while you're doing the job anyhow. Get greasable ones for where it bolts to the unibody or you get squeaking. Those polygraphite bushings have the rubber ones beat hands-down IMO and are very inexpensive.
And remember that some bars need to be torqued with the car's weight *on* them and some need to be torqued with the weight *off*. Find out which way is correct for your car before you do the work
