re: How much child support should I expect to pay?

Why not try marriage counseling if it's a "nagging" issue? Did she cheat on you? Is she abusing you or the kids?

You must have fallen in love at some point, right? Why not try to rekindle that?

Anyways, if $1500 is really the amount like some have suggested, then you'll be doing just fine IMO. And no where near broke.

$110,000 is ~$75,000 after taxes and insurance (I'm assuming if you're making $110k, your employer probably covers a chunk of your health insurance).

That's ~$6250/month.

Minus $1500/month in child support...plus let's add an extra $750 just because we'll assume you're a good father and will want to provide nice things for your kids along with saving for their college.

That leaves you with ~$4000/month after taxes, insurance, and child support.

And you'll be single.