OMG. Since you have a d series engine I'd just do it yourself. Base price starts around 800 for getting off cheap. You can buy complete kits off of ebay for that car for about 800-1200. If you but one new you're looking to spend 3000, especially if you get any sort of bling.
http://www.homemadeturbo.com/ <----Awesome sight for learning about turbos.