you don't "need" a fisheye for skateboarding, its an incredibly overused and boring look, edits with it just piss me off honestly, its pretty annoying. but if you must, follow eheath's advice... a properly shot edit will look better by miles then the same recycled lolol i have a handle and a fisheye im gonna hold it right near their board as they do a kickflip! style.
p.s. handles are pro so get one to make your footage much better.