So... there I was in Phoenix. I'm worried about the weather that's supposed to be moving into the Los Angeles area. I don't have the option of leaving while it's still daylight, but I'm strongly considering leaving at night, because then I only have to worry about the darkness instead of worrying about clouds. But the route is fairly desolate, and there's a BKN layer at 15,000 preventing any moonlight from getting through. Plan would be to follow the 10 freeway back home, and I have terrain warnings in my 530, which serves as a good backup just in case. Then I look at the following day's weather. I check the TAFs. I get an outlook briefing via DUATS. I check two different weather guesser websites. Everything tells me outlook is VFR until about 6pm, with BKN150. I figure we're going to be wheels up around 9am local, which puts us home at 11:30am local after accounting for the time change going back to California. That should mean we're in the area and safely on the ground well before weather changes. But I'm leery of the forecast, as LAX is always grossly optimistic when it comes to weather reporting. But I figure even if the forecast is wrong, I can divert to a field that will stay VFR for a while before the weather makes it that far inland. So I consult my former flight instructor. He convinces me that flying back at night is a bad plan. I am aware that I'm being strongly influenced by a desire to get home before the weather so the get-there-itis is strong. But I also know that I feel comfortable with the circumstances and my proposed outs. I know as long as I'm near the freeway, I have a relatively flat surface next to the freeway in which to land. But the forecast the next day says ceilings remain high until 6-7 hours after my anticipated arrival. So I decide to rest up instead and go with my morning departure plan. Wake up in the morning and check the weather. The forecast has updated somewhat, and instead of the METARs saying BKN15, the reports now say BKN12. And the TAF at LAX hasn't changed as far as the timing is concerned. I figure I'm good. We depart. Ceilings stay high. Got a little virga and a little bumpiness on the way out. But no big deal. Pick up a strong tailwind, which wasn't forecasted and was nice to have and something I'm not used to on an east to west heading. The rest of the 2+ hours are uneventful. I get back to the SoCal area and I know I'm going to have to descend. METARs say the clouds are BKN055. I'm down to 4,500. Nope. Descend to 2,500. Now I'm just at minimum clearances below them and I can see they're still coming down. CRAP. I look ahead and I know I'm getting close to Fullerton. If I have to proceed straight AND get lower, I'm going to bust their airspace. Then beyond them I have to deal with KLGB which is always a madhouse. I don't want to have to request transitions at 1000 AGL from back to back towers when I'm already feeling overwhelmed by weather conditions. Screw it. I'm on flight following so I tell them I'm turning around due to weather and changing my destination. They tell me there's a plane straight ahead and below me just departing Fullerton. I tell them I have the traffic in sight and I make a right 180 to get out of there as the clouds feel like they're closing in. The rest of the flight is uneventful, we land, get treated really well by Luxivair at San Bernardino (KSBD). Delicious cookies, full fountain drink bar, 'vending' machines with free stuff, and a 12 seat mini theater with plush reclining seats. Waited there for an hour to see how weather went. It didn't get any better. My alternate plan was to fly south, get to the ocean, and descend to 500-1000 AGL over the water and squeak in to the home drome SVFR. Girlfriend was with me so I wasn't willing to take that risk. Someone's gotta raise our dog, after all. So we rented a car (another adventure in and of itself, this one much less pleasant) and now my airplane is an hour and 45 minutes away. Now for the kicker. In case you didn't notice earlier in the story I made it closer to my destination than where my plane ended up. My concern was that an airport was in my way, preventing me from getting to an airport. Because my flight planning said KSBD was my alternate. I was too concerned with aviating that I couldn't think on the fly to just divert to the field that was a few miles away that I would have to descend into anyway. So that's the lesson I learned. When thinking about an alternate or divert field, don't get so fixated on your pre-planning that you're unable to see an obvious answer right in front of you.