There are some deals on in the o2 stores at the moment where if you take a 24month , £10 contract you get a free phone (sony ericsson X8 and the Samsung Pixon are the best handsets, off the top of my head)
You also get the option to buy a Ps3 for £150 , which has the motion move included.
Or the Xbox 320GB for £100 .
It might be worth taking out a contract if your looking at buying a console anyway.
There are also deals where you pay less for the consoles if you take a higher tariff with selected phones.