The AlterKtion is pretty much a bolt on thing, I think you MAY have to drill a couple of holes for added support but that's about it.
As for the Magnum Force kit...The main complaints I've heard about it are,
1. It put's alot of stress on the stock upper shock mount so if you use one you might want to support this more so problems don't start up down the road.
2. It sticks the front tires out farther than the original suspension, so your tires may hit the fender.
3. Not all the bolt holes line up.
4. More than a few Complaints of them sounding arrogant when you talk to them. I've actually seen this first hand too, many years ago at a car show when I was trying to talk to them about doing some work on my car.
I'd go with the AlterKtion kit, great product, great customer service.