They stock suspension is super soft. It isn't horrible for a n00b rider, but once you realize you can toss them into turns you'll want something more suited for it.
A Gixxer front is a direct bolt on. Massive improvement over the stock forks, and clip ons are > handlebars, so add that for another plus. You've got quite a few options when upgrading the rear.
The best part is all of that can be done cheap.
... and as a matter of personal preference, add the lower plastic cowl that hides the stock pipe, makes the bike look 200% better.