i think you can't really beat a 12mth free Blackberry on a 12mth contract!
scroll down the page, you will see the 12mth contract deals.
the T-Mobile Flext 35 has £120.00 montly allowance to spend on: Calls to local and national numbers, calls and texts to UK mobiles, picture messages and voicemail retrieval in the UK. unfortunately you will need to pay extra for data allowance.
possible to earn £20 'recommend a friend' rather than the £15 QuidCo offers. it's either or, see details at http://www.phoneboxdirect.com/recommend_a_friend.asp
note there is a £2.50 admin fee for any order, even if it's declined by the network.