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My money is on magnetically-suspended Tokamak design, like ITER. Fortunately, most of research money is going in that direction as well. Burning Pu or reprocessing will work, but is very messy. Spent fuel must be stored for a looong time...100000 years or so.
Fusion is so much cleaner. Yes, fast neutrons hitting the walls will make them low-active but much less so than spent fuel from fission reactor. Unfortunately, capturing neutron flux and actually turning it into energy is the biggest problem. Making fusion happen is already possible in Tokamak's, the trick is to make net energy profit out of it. Neutrons make chamber very brittle...at least that's what a scientist I spoke with said to me.
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Thank you for your time,
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