I'd go with cheetah's revised calendar, if only because our 10th month is October and 12th month is December. A part of me cringes every time.
And the fact that (Sept)ember is the 9th month and (Nov)ember is the 11th month doesn't bother you? Blame the introduction of January and February, Up till then, the calendar had only 10 months of 30 or 31 days. The part of the year that took place before March just wasn't assigned to any month. On the other hand you can thank Julius and Augustus Caesar for renaming two months after themselves or you would have a 7th month named (Quin)tilus and a 8th month named (Sex)tilus.
As far as cheetah's calendar goes, it really doesn't make sense. Mainly because synodic month (the cycle of the Moon's phases) lasts ~29.53 days, not 28, So the number of synodic month in a year is a bit over 12 1/3. Besides that, 364 day year is ~1.25 days shorter than the Tropical year(The time period that governs the seasons), so in just 24 years the calendar will have drifted 30 days with respect to the seasons.(This is why we switched from the Julian to Gregorian calendar; the later kept better time with the seasons).
That's not to say the present calendar couldn't be tweaked a bit to make it a bit more "user friendly". Right now the pattern of days in a month goes 31, 28(29),31,30,31,30,31,31,30,31,30,31. With a little tweak we could have 30,31,30,31,30,31,30,31,30,31,30,30(31). Odd months have 30 days and even ones have 31(except for Dec which has 30 in non leap years and 31 in leap years.) Easier to remember how many days are in a given month, and puts the leap day at the end of the year rather than part way into it.