I'm generally somebody who goes for all the options. I'm not a fan of a low or no-frills vehicle, but I go into the situation knowing full well the potential implications of that decision and am comfortable spending that extra amount of money. Hence you don't see me soliciting for opinion on my purchasing decisions.
There was a time, almost 20 years ago, when I was fresh out of school and had yet to find or create a situation of stable employment. I was saddled with payments for a vehicle I had a very hard time affording at the time, which was my "to school" transportation. Instead of buying something cheap, I had, under the encouragement of my parents, purchased an "almost new" (it was two years old) Explorer. It sucked fuel, drained my bank account for payments and insurance and was generally a massive burden. I was single teenager, living at home at the time, and still, it was a struggle. And when I got my first "out of school" job and my own place, and was still paying on that beast, that struggle continued until I was no longer making those payments, which was a massive relief.
So, based on what you've shared, given the lack of stability your situation appears to afford, the fact that you have children, a (broken?) marriage and no real prospect of long-term employment, I would be extremely hesitant to saddle yourself with payments again. What you can "afford" on paper now doesn't matter. Until you are in a situation where the outlook for stable income far exceeds the period for which you'll be making payments, the risk is substantial.
Now, I'm not saying you need to be able to pay cash for your vehicles or any of the other lovely BITOG financial advice that seems to accompany any discussion of vehicle purchases on this site. My two cents is entirely based on the information you've provided regarding the lack of stability with your work life, your relationships and subsequently your finances. In my mind, a payment is not something I would consider adding to that type of situation. With the insanely low interest rates (0% anyone?) available, and the potential return from investments, one can be (IMHO) better served by plopping down a decent downpayment and having payments on a low or no interest vehicle loan while the money they would have spent makes them money. However this relies on having a solid source of income with long-term stability and cash in the bank.