PS3 is better overall technical package and shares a pretty strong mutli-platofrm library with 360 (GTA IV, DMC4, Assassin's Creed, Bioshock, etc.), has its own good exclusives such as Uncharted with a very good lineup for future, but you lose Halo, Gears of War and some pretty good RPGs plus some interesting exclusives on 360 side like Alan Wake... however I get feeling from your responses you prefer 360 games/live and if that's the case then get a 360.
Reading the thread I see 4 or 5 pro PS3 suggestions, followed by you going "But..." which implies to me you feel the suggestions aren't suiting your own tastes, knowledge, etc. So perhaps a 360 is the better route - if so I'd wait and see if the price drop in September is true.
Or take the populist route and buy a Wii!
Or aim high, save more, and buy a gaming PC rig and play games like UT3 properly...
Try to be reasonable... its easier than you think...
