Strangely enough, when I need advice about anything in life, I come to celticsblog

So here’s the deal:
I owe $180,000 on my home, and can’t afford to make the monthly payments of $1100 due to a chance in circumstances which includes divorce and having to pay loads of child support every month. I have 2 x interest only mortgages: 6.5% fixed ($140,000), and a variable, currently at 4.725% ($40,000)…. yeah, so I’m not paying any principle, and have no equity.
My house has been on the market for almost 3 years, and is currently listed at $169,900, so including real estate agent fees, and a lower offer by the buyer, let’s say I’m losing ~$30,000 when it sells. Unfortunately, this money will be coming from my 401k plan, which becomes a ~$520 per month payment to pay back.
My plan is to rent an apartment if it ever sells, and let’s even say say I get a steal on rent at $650 per month.
Even with that, my overall financial situation does not change significantly from how it is now, due to that 401k loan to pay each month.
On top of that, there are other compelling reasons to consider foreclosure besides financial ones. Namely, that it is an hour from where my life actually is (girlfriend, job, etc), I don’t have time for the maintenance of it, and in general, it’s causing copious amounts of stress in my life.
I have no interest in renting the house. Properties in that area are not renting for anything close to my monthly mortgage payment and I don’t have the time to deal with that, nor do I want that added stress.
I understand that for seven years, foreclosure will negatively impact my credit, my ability to get a car loan, another mortgage, possibly renting an apartment, etc, but I think I can live with that - I don’t even think that I will need anything involving credit besides an apartment to rent, but a lot of renters won’t check credit for that anyway I’m guessing.
So in short, my three most compelling reasons for my interest in foreclosure, is I can’t afford to live with the expense of this house, I’d really like to avoid the burden of a ~$520 per month payment, and it is causing unmanageable amounts of stress in my life.
Should I do it?
And if so, how do I go about it? I don’t necessarily want to or need to stop paying my mortgage. I’ve heard that makes the affect on your credit so much greater than foreclosure alone.