"A lot of Mazda6 intenders might find the four-cylinder mated to the five-speed manual to have the best balance and provide the most fun. After about 2500 to 3000 rpm, the four- cylinder was downright gleeful to flog. The V6 was, of course, more powerful, and therefore more fun to simply floor the throttle and haul, but we?d go for the four-cylinder with the manual. Mazda expects about two-thirds of buyers to choose the four."
I think AutoWeek is correct. At this point, I think I'd opt for the 2.3L 5spd combo. We all like power, of course, but the V6 brings added weight, marginally poorer handling, worse fuel economy and a higher acquisition cost.
They mention the development of a 2.8L I-5. That could be the best compromise.