I have a question for the group. I took off Sunday in nice VMC and climbed to 12,500. My route of flight showed lots of thunderstorms but nothing I couldn't pick my way through using the XM weather. After about and hour of going around thunder bumpers I found myself clear of all the storms but over an overcast. This didn't bother me to much because my destination METAR was SKC. However, I noticed that the airfields under me were coded red. A quick check revealed that most of the airports for the next 100 miles were 300-500 overcast. This was unexpected because I had checked the wx at few fields along my route of flight and none were calling for low ceilings like this. I basically bracketed the low weather when I did my wx check. So, here I am with thunderstorms behind me, an undercast from about 2500 to 300 feet for the next 100 miles and a destination calling good wx. I had two choices. Press ahead or turn around and deal with the thunderstorms and find a airport to land. I chose to press. Now I had a while to think about the situation I was in. As long as the motor kept running I had no problem but if it quit, I was going to have my hands full. I fly a -4 and always wear a parachute. So I started thinking about my plan if it did quit. As much as I wanted to say land it, I kept coming up with the best solution would be to attempt a restart until about 3000 and prior to going into the wx, jettison the airplane. I just didn't think the chance of success was very good for flying a flameout, made up on the fly GPS approach to an unknown field and breaking out at 300 feet. Plus once I got below 2000 the jumping out option was gone. I had thought about this for night flying some but I had not considered this scenario. Luckily she purred all the way to my destination as she should but I'm wondering what y'all think the best COA would be if the engine quit in this situation. Please don't focus on how I got there. The question is jump out or try to land. What ceiling is required if you try to land?