Yes, you can use 105 brakes with DuraAce levers, Sram levers with Campy calipers, etc. etc. That's how TriRig can sell lots of folks the OmegaX aero brakes.
IME good pads are 90% of the equation. I'd use Sora brakes with DuraAce pads over the reverse. Get some Kool Stop salmon pads and even low end brakes are really good.
Related plug: I have some old Ultegra calipers from my former tri bike if you are interested in some quality (though dated) brakes cheap.
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