I think your number is a bit high. Looking at a few calculators, even if I push the property tax & insurance numbers quite a bit higher than I think is credible, I can't get the numbers past $3800/mo or so. More reasonable seems to be around $3400/mo. So that's $40k-$46k/yr, well below that overinflated $70k-$100k figure quoted upthread.

Also your math is off: even at your $4200/mo estimate, that's $50,400/yr, nowhere near your "not too far off" $60k. And that puts it at 30%-50% below the $70k-$100k range, which makes that range laughably inaccurate.