I think it still is good depending the condition and care that the car has recieved. If you go on a website called autoscout24.com (it has a option for english) you will see how much some E30 M3's are fetching that are in pristine condition, to include classic Alpina BMW's.
Now, when you talk about the falling dollar rate, trust me, it is painful here in Germany if you're a Soldier. Back before the Euro, the dollar would get you 3 Deutch Marks. With the Euro, the highest I have seen it is .87 euros to the dollar and it is currently at .67 for the dollar. It can sometimes be even more painful when you want to go shopping outside of the base (unless you don't have a problem looking like every other american stationed here). The dollar has lost so much of it's clout that recently India decided not to use USD for transactions or payments in their country. And if something isn't done quick to fix it, the dollar will wind up being relegated to chump change.