i went for the argos deal myself, it's only on for a week, started on thursday, for £250 you get the premium xbox360, a free "megapack" worth £70 (which contains a madcats steering wheel with pedals, extra wired controller, and dvd remote control), halo 3 worth £39.99, and one other game of your choice, including PGR4 which is what i got, worth £39.99, but they have PES2008, and a load of other games too
so £80 of games, and £70 of accessories free with the £250 console. i didn't get an hdmi version as they had none in my argos, but some people got them according to another forum, it just depends on the stock they have
i got the vga cable from game for £15 so i can keep my old xbox connected with xbmc via component and my dvd player via hdmi, and i just unplug the pc and connect the xbox via the vga socket on the front of the plasma media box (it doesn't have 2x hdmi sockets anyway)
i haven't had much time to play with it yet though. my next purchase will be the HD-dvd drive from gamestation at £100 and i can claim the 5 free hd-dvds
hmv have another deal on, £315 gives you the premium xbox, plus hd-dvd drive, plus i think one extra wireless controller and one game (forza 2 i think), so thats a good deal too. i'm happy with my choice of games, i suppose to get the hd drive, its £35 i'll pay more than hmv but i get an extra game, steering wheel and remote for the £35, which is a pretty good deal i think