I personally would use a Dino oil if I could because I have the confidence to know that it has more than enough "umph" to protect my engine properly...
In my situation I use a full synthetic that contains lots of PAO and other additives to make it flow at extremely cold temperatures like -50oC because my engine is picky and will suffer from lifter ticking on cold-start if I don't and this is really amplified in the brutally cold winter weather and can last up to 10 minutes and this is way too long for my comfort level.
I also drive a lot of miles for my job and it's nicer to be able to extend my OCI safely using Syn and not have to crawl under the car as often.
Also this engine seems to run a lot smoother with Synthetic so I keep using it.
Otherwise I would be a whatever is the cheapest dino on the shelf that meets the current spec's. I would run it to 5K miles without a problem or less if specified in my owners manual.
In my '89 VW Cabriolet and '91 imported Austin Mini I run whatever is the cheapest dino that's a good deal and gets the job done. I occasionally switch to synthetic if I get it for a steal.
As for what weight of oil to use, I would look in your owners manual at the temperature vs. viscosity chart and choose the oil based on what fits the best temperature range for the region you drive the car in. Eg: Winter/Summer - perhaps a 5w30 year round.
Don't get caught up in the thicker/thinner is better, use what's recommended by the engineers that built your engine and that's what's in the owners manual and not on the filler cap or from everyone here at BITOG. (No offense to anyone, I just think the best choice is specified in the manual)
Good luck with your oil choice...