Hi Chris - If you haven't done it yet, you might do a quick check of the blue book value for your area. I'm not sure, but $5500 sounds a little steep for a car with a dent. As you know, SAABs are weirdo foreigner cars in our neck of the woods (i'm in cincinnati).
In addition to the online sources mentioned, you might want to pick up the Haynes manual for our cars (I think Amazon has it). It's written for the british models, but for most things you'll do just fine.
For parts, you might check out
www.eeuroparts.com and
www.thesaabsite.com, their prices are about the best you'll find online, and the sell most things you'll need to fix. Your local NAPA/Pep-Boys/Autozone/Advance Auto etc will often have good prices on generic parts such as belts, some hoses, vacuum lines etc. I've also gotten good prices from these box stores for mufflers too, so it's always worth a quick call to check prices.