front shocks off a banshee will fit. But...... they will make the front of your warrior higher then the back. The rear shock off a banshee will also fit but hits the airbox.... so not a good idea unless you do somthing about you airbox.
there's really no advantage of banshee shocks over warrior shocks. they both use the same stone-aged technology. You need to go aftermarket to get better shocks for the warrior
I think the warrior stock front shocks are fine. Unless you plane on jumping it 10 to 20 feet in the air. I have the rappy rear shock and stock 03 warrior shock in the front. awesome set up!