Yep, that Silverstone ST45SF-G 450W SFX12V PSU works well with the proposed setup and shouldn't cause any issues. And it's perhaps one from a small selection out of the SFX12V power supply units that can power such high-end setup in an ITX case. The other one would be the little brother of the ST45SF-G, the ST45SF vanilla, which is rated 'bronze' instead of 'gold'.
A review of the ST45SF-G by hardwaresecrets.com: http://www.hardwaresecrets.com/artic...ly-Review/1662
On the other hand that Cooler Master Elite 120 Advanced ITX case does support normal sized ATX power supply units. Perhaps choosing an ATX PSU rather than a SFX12V PSU. Or you want to install a bigger CPU cooler in it and such ATX power supply unit would block it?