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I suppose this is really a matter of what your goals for the car are. If funds aren't really an issue then all three would be viable. It's just that if you are looking to make 240 whp than the supercharger is nice in it's self contained simplicity but then you are going to have to worry about heat management. The KA-T is a proven combo and is nice because you can intercool it so intake temps aren't as much of a concern and I would say that 300 whp could be made reliably w/o spending too much on your build as that's about the safe limit of the stock transmission. The most expensive choice is by far the LS. I've researched it pretty thoroughly about a year ago and is the way I personally want to go on my own project Silvia. I would say it has more room to grow in the long run as far as RELIABLY making hp being it was rated at 350 flywheel bone stock. It has the transmission that can handle the abuse and the low end torque that it makes is really nice for drivablity. But you do have to be more concerned about ground clearance as the headers are going to stick about an 1" below the frame rails and the complexity of everything that goes into an exotic swap like this isn't for the faint of heart. Do keep in mind that the farther you modify something passed where it was originally designed to operate the more weak links you are going to find and the more parts you will need to invest in to keep it together.
This is just my 2 cents and I'm sure that you'll get a different response from everyone you talk to, but whatever you chose just make sure you do it right by using quality parts and don't skimp on the maintenance. Then you won't have to be constantly tearing it back down and doing things over by rushing through it. Hope this helps.
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