Welcome back, NJ! I knew you couldn't keep away.
First, if not a Saab? - Pete mentioned Skoda. A pal's OH had an '04 Octavia estate 1.9 tid manual, with the higher output 130 bhp. Put nearly 100k on it before replacing a few months back with a Fabia. (Rolls eyes.) Pal's car was a BMW 525, 1995 N reg, 190 horses or so. Went like stink, but he preferred driving his wife's Skoda for the 230 pounds of torque, the BM managing 50 less.
However - it has to be a Saab. James, you'll have read all the old posts about petrol v diesel, running costs v service costs, insurance (with and without Hirsch...) , RFL, etc, etc. FWIW, what about a petrol 2.0? Maybe not the power you're after, but still worth considering. Must be loads of late plate Ednas out there.
9-5 or 9-3? You'll have read all the arguments here too. Me, I ran a 9-3 for 6 months, around 8k miles. The main reason I got rid was the sheer uncomfyness of the seats. Worst I've known in 44 years driving. (second worst - Merc S Class.) I've now had my 9-5 for 8 years, done 104k, and never get out of it with irritable undercarriage, even after driving 200 miles non-stop. Others will say different, it was a discussion on the old forum. Because you know what a 9-5 is like, I'd strongly recommend a good long test drive in a 9-3 before you buy one. When I used a main dealer for servicing, I had the use of different 9-3s as loan cars. The different trim levels and seat options did nothing to change my view. And don't forget the hand-unfriendly handbrake on the 9-3.
I echo sgould's observations on the dimensions of the two cars. I know what the tape measure says, but the 9-5 is bigger. It just is, don't ask me how. It just is. It feels wider inside, passengers have more room.
NJ - the choice is yours.