The Mazda6 starts at $24,495 for the base version with manual transmission. The fully loaded 6 GT with the six speed automatic and the technology package starts at $35,095.
After debuting to much hullaballoo from enthusiasts, the Mazda6 sedan has soldiered on in near anonymity in its current generation - I see oodles of 3's on the road but it's rare to see a 6 around here, and that's a darn shame because the 6 is pretty well everything the 3 is, but bigger (though no hatchback or V6, alas).