If its a MKII it should have hydraulic forks. If it doesn't, they were replaced at some point.
I'd say buy the complete magnum for $700. With prices on the rise for individual components, and many of those parts pretty tough to find, its easier to get it and rebuild. Thats not to say you couldn't do it the other way around, but it will be tougher, and probably more expensive. Its all the little stupid parts that add up the fastest.
I'm not a fan of maxi forks on anything. Do it right.