If you are looking for an inexpensive solution, Creek makes a passive preamp with 2 inputs and remote control. I have no idea how it performs. It is $450 new at Audio Advisor and they have a 30 day money back guarantee. Another inexpensive solution would be a used Adcom GFP-750 passive/active preamp for about $600.
http://www.audioadvisor.com/store/productdetail.asp?sku=CROBH22&product_name=OBH-22%20Remote%20Passive%20Preamp
http://www.audioadvisor.com/store/productdetail.asp?sku=CROBH22&product_name=OBH-22%20Remote%20Passive%20Preamp