Mobil 1's sucess is the result of marketing, just like Energizer. I thought you guys saw through that stuff??
I'd certainly recommend synthetic on any performance engine, turbocharged engine, and any that you want to live for a couple hundred thousand miles. It just makes things a little better.
There are certainly percentage points to be gained with the various synthetic fluids but whether you or I are capable of noticing it, remains to be said. Our checkbook certainly notices that synthetic stuff though. Try doing a Mobil 1 oil change with an Alfa V6, 7qts at around 5 dollars each. In the end, synthetic is better, but whether its worth the high cost is something your budget needs to decide.
As for oil filters, stay away from Fram. And I'm not quoting some silly website. I've personally had an engine taken out by an internally disintegrated Fram filter and I've taken several off of cars that were well on their way. The better oil filters are the Mann, Hastings, Wix, Purolater Pure One, and others. Take note that many of Napa's filters are made by Wix. However, I don't advocate spending money on expensive oil filters like K&N and Mobil 1. Its simply rediculous.
Brake fluids were mentioned earlier. Use Dot 3 in clutch systems and Dot 4 in main system.
As for coolant, look for a phosphate free and silicate free coolant. The better auto manufacturers sell this style coolant because they don't like lots of their customers coming back for water pump jobs while still in warranty. BMW will even warranty their water pump for life as long as you use their nice blue coolant. The blue Audi, pinkish orange VW, and orange Dexcool (GM) are good as well.
On the subject of GM, they actually specify synthetic transmission fluid for many of their vehicles now. I believe its Dexron V...
As for Saabs...I've worked on many. And there's a very good reason why everyone in my shop has sworn to not allow each other to buy a Saab. No matter how cheap or how nice it appears. Stay Away!
Mark