Any Alpine with an 'A' in the model # (CDA7847) will work using the KCA121B Aux input cable. '05 models start at $199 retail.
www.alpine1.com
Any Pioneer with a 'P' in the model # (DEHP3700) will work using the CDRB10 Aux input cable
www.pioneerelectronics.com
Several Clarion models offer Aux input for 05
www.clarion.com
All sites should have locators for AUTHORIZED RETAILERS in your area. A LOCAL BRICK AND MORTOR SPECIALIST retailer should be able to help with technical questions and installation as well.