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As far as speed of light in vacuum is concerned, no-one said it is the highest speed.. it is just a constant.
Particle with any mass greater that 0 can't be accelerated to c ( because for that we need to apply infinite amount of energy... but if "particle" has imaginary mass (tachyon), it can travel with speed higher than c and no postulate is violated (OK, Carl, you can shoot me now)
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Leaving aside the Quantum Field theory considerations tachyons don't violate SR. Tachyons form a symmetrical theory of SR where the speed of light is a lower limit instead of an upper limit.
Regards
Steven