If you aren't in a hurry, I'd wait and see what Magneto's buff looks like at the end of August / beginning of September. If you are eager to get a R2, then Havok would be the way to go with your options.
Edit: I'd suggest waiting because he may be exceptional even without the dupe, and then another viable option.
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Edit: I'd suggest waiting because he may be exceptional even without the dupe, and then another viable option.