Strut braces are good to start. The second gen Legacy will take 93-01 braces in the front and 02-05 braces in the rear. The under side H braces only fit turbo cars due to exhaust routing. We don't have the hardpoints for fender braces, but I might weld some in. Also, locking down the rear subframe can help with a nervous rear end. Swaybars along with endlinks and bracket bushings should take care of a lot of roll, and paired with good springs and struts roll shouldn't be an issue. Lowering the center of gravity could help too though.