I find that a lower front suspension tie bar makes more of a difference than a strut tower brace. The one that connects the front lower suspension arms together. Since they are cheap, do them both! I'm really cheap and made my own with some scrap 3/4" conduit.
Also, inspect your suspension bushings, ball joints and tie rod ends closely. Check for play with a pry bar. Check the rear trailing arm bushing up where it connects to the car, those seem to be a common failure location as the rubber begins to delaminate from the trailing arm.
Oh, yeah. Do your own string alignment. Then do it again after driving a few weeks, after the suspension settles in.