beam swords are like the ****ing win. that item gives Peach new range in tactics. all approch on nearly all your enemies will be ****ed (especially on small boards). XD It definitly replaces your normal Foward smash and Foward tilt nicely.
Saturn is good to have if your opponent likes to shield a lot (or is either Bowser or DK). It's a pretty good shield breaker and it stays on the field a lot longer then the other two items.
Bomb-ombs are like a double edge sword. It can help you, but it can also screw you over. While they're lighter and farther to throw, it makes for a really good early K.O. But, if it's caught or reflected and you don't move, you could get hit badly.
Stich Face are like bomb ombs except they're reusable if you catch it and they don't go that far when you throw it. Also note, since it's reusable, it could backfire on you worse since your opponent could catch and use it.