Are you paying in full or will you be trading another console in?
Depends on how bothered you are about the HDMI... Some of the offers currently around are...
Amazon PS3 + HDMI = �399
Amazon PS3 + HMDI + Game = �430
Play PS3 + HDMI + Click (Blue-Ray) = �399
HMV PS3 + Game = �424
Game PS3 + Game = �424
Gamestation PS3 + 2 Games + X-Men (Blue Ray) = �459
As I say depends on what you want, you can get an HDMI for �10-�15 and because HDMI is digital there is no advantage in the quailty of the cable there is with analogue cables.
On the trade in front I have found Gamestation to offer better trade in values.