I've spend $5,000 at a local store called Tunerworks in upgrades. My Jim Conforti Carbon Fibre CAI was $500 alone
. That doesn't include the maintence and repair costs. I don't want to sell it but my wife really does care how much I spend.
I actually did almost buy an E36 M3. Found one for sale when I was looking for the one I have now. I couldn't justify spending $500ish per month on insurance. It was a Cosmos black M3 coupe with black Vaders. Soooooo nice. Asking price in 2005 (it was a 1995) was $25,000 CDN.
That's cool. Make sure you let us know how those are when you get them. Should be good.