Bloody hell Mark, how did I miss this thread!
Although both the 9-3 and 9-5 are based on a Vauxhall platform, Saab has done plenty with these to make them very un-Vauxhall-like.
I've just acquired a 2002 9-5 Aero with 1 owner, 60K on clock for an unbelievable steal and it puts a smile on my face every time I jump into it! (250 BHP, 0-60 in 6.5 secs


)
Out of the 9-3s, I definately prefer the 02 model to the later ones - in fastback they look more like proper Saabs.
I do agree that the 2.0t 9-5 model is a bit underpowered for the car's size.
If you can stretch to an Aero spec model I would as they SE spec is fitted with a Garrett turbocharger and the Aero is fitted with a Mitsubishi TD04 turbo (same on both the 9-3 and the 9-5, and the Scooby Impreza!!) - my understanding is that the Mitsubishi turbo is more reliable good for 150K, even though it is a high-pressure unit. There isn't much difference in the car's fuel economy so long as you don't go stupid with my right foot. I managed 40mpg on a return run to Luton airport.
Even though the 9-5 has a higher milage, I wouldn't be put off with high-milage Saabs - they are generally driven by people who look after them and are good for 200k miles.
If you want a blast in mne give me a shout