I know you said you don't want a 'cashback' deal.... but for anyone else looking - I've run a free phone (with free calls anytime) for the last 3 years...and there are many out there..

http://www.buymobilephones.net/store/fulldetails-14672.ihtml

http://www.dialtosavemobile.co.uk/

http://www.mobileshop.com/mobile-phones/o2/contract-mobile-phones/nokia-6030.php/PNEWO260300003