Seen this deal on Mobiles.com:
It's the 24 months panther 40.
If you don't mind the hassle of halfprice redemption then the cost comes to:
15x£40 = 600
9x£20 = 180
So £780 for 24 months of 900mins, unlimited (3000) texts, and 750mb of data.
PLUS you can get £50 cashback at quidco
And the obvious orange benefits including magic numbers and orange wednesdays are there.
the handset is FREE.