A lot! Check out www.2002ad.com. They have a lot of 2002s for sale and you can compare what they are selling theirs for with yous. 2002tii can bring $20k and Turbos can bring as much as mid $40ks. So you are probably in between somewhere.
Post your question and some pictures over at BMW 2002 FAQ forum. Some owners there have Alpina 2002s, and can answer this better than a retailer.
