Saabs to include:
9-5 Aero & Aero Estate
9-3 Aero
(no point suggesting a 9-3 convertible since they only ever show them with the roof up anyway)
9-2 (as long as it can be tuned in the game to match the Imprezas - I just wish that they used a proper Saab interior for that car rather than the boring cheap Subaru dash).
9-3 Pikes Peak
9000 Turbo
900 or 99 Turbo
The 95 or 96 V4s and Two Strokes, for a classic rally part of the game
Any or all of the Sonnetts
For Volvo:
240 Turbo
740 Turbo
850 R and estate
850 British Touring Car (the 1993 season when they ran the estate!)
But to be honest I would take any participation from Saab, and it would be good to see Volvos in as well. Just as long as the makers ensure that you can tune these cars in the game to be competitive with the Subarus, Mitsubishis, Nissans, Toyotas etc. - which are too highly tuned anyway I think. One problem I have with previous GTs is that you could not tune your BMW, Audi etc. to the same level as the Japanese cars, so you hardly ever used them to progress.