You're in luck, I know a thing or two about SAAB cars
Firstly, the 9-3 (Excellent choice) is a great car for you and possibly a small family. The 9-5 is a tad larger and is generally considered to be a little more comfortable. Look for the Aero model 'Top of the range' or Linear or Vector. Some of the Linear and Vector models benefit by enhanced packages so check these first. The 1.8t is alright if you just like to go from A to B without to many thrills and spills and is pretty good on economy. The 2.0t or T low pressure or high pressure turbo model is very good and can be remapped quite easily for additional horses. I personally have no time for the V6 models, they drink faster than a really cheap date for the one night if you get my drift, and with no guarantee of any fun being had that evening
Reliability: Tough one, these cars need to be loved and shown the love, if there is no full and comprehensive service history then 'Walk away'. These cars have the ability to empty the wallet faster than the above cheap date or HMRC.
Known issues with the 9-3s are front drop links, upgraded stronger versions are available for a few pounds more than the standard. Crank position sensors go after 10 years and will not allow the car to start, straightforward to do but budget around £150 to replace. They only like NGK spark plugs and a very small range at that, put another make in at your peril, this can damage the individual coil packs and that will set you back £500 plus to replace.
Stay away from 2003 models 'Mine' as this was the very first model that uses fibre optics, very fussy and known to throw a DIVA style temper tantrum every now & again. Look for 2005 and upwards. Manual gearboxes are ok and there is both a 5 speed and 6 speed version available which includes the automatic too. The 6 speed manual can be notchy on changing but again there is an upgrade kit that corrects this. Parts availability not a problem, many service centres and independent specialists around the country that can help.
I think that about covers it, feel free to ask if you need any further help. Oh, don't touch the diesels.
@auds2