Wotcha and welcome George - we have members that don't own Subaru's and we welcome their enthusiasm / contribution.
firstly I must declare my bias in answering your question as I owned an 08 STI PPP 330 Hatch.
It was used day to day ferrying kids about but would induce huge smiles when nailing the twisties a very flexible car. The suspension is softer than a civic s so as standard you would have no problems - my intention was to invest in different ones though as it would benefit from having the front dropped 10mm and the rear firmed up a little this would sharpen up the steering and stop the front rising as much under hard acceleration.
Be under no illusion here though I believe you will be blown away in comparison to your SAAB its a completely different experience (unless your SAAB is one of the rebadged Subaru's built under licence for SAAB).
The ringland failure as I understood (and did contact Subaru to verify) was attributed to the standard STI's and the PPP 330 modded ones had the parameters in the ECU to avoid that happening - that was until Pete posted that his mate has experienced it, that is the first PPP failure I have heard / read about.
You will read a lot of adverts with the hatches described as Type UK STI's - unless they have the dealer PPP certificate they are not Type UK's and running circa 300 bhp. Check that these have had the ECU mod from the Subaru dealer I was quoted £40 to have it done if needed. A low mileage FSH version of these is still a good buy because they can have a professional ECUTEK remap done by people like Andy Forrest or Jolly Green Monster. This remap will de risk the ringland failure issue and also - should you desire - install options like flat foot shifting, downshift throttle blip, launch control and anti lag :D
My advice go and have a test drive and I dare you to not smile.
As I said I am biased but I thought the car was just awesome
Pete + some of the other owners will probably be along in a bit to add their 2p as well