Aww my Swaybar :) I'm so proud of it
Most people seem to be satisfied with changing over the rear only (I'm one of them), as for street use the standard front sway bar seems to be up to the task, however, if you're wanting to go to the next step in handling, or considering doing track work, then you may want to change the front.
Like all mods, I think it's best to take a progressive approach. Do one thing at a time, in this case the rear sway bar only, then if you find that the front end could be sharper still, change the front later too, but you may find you'll be happy with the rear only and only fitting a strut tower brace to the front end.