Got a KDL40V3000 from an independent dealer in Belfast a few days ago. Price from the dealer was £899, though I took a package which also included a Toshiba DVD Recorder (DR17DT) which has 1080p upscaling, glass plinth, golf HDMI cable and 5yr warranty for £1200. As it happens my friend bought the TH42PZ70 plasma, which I was interested in, but I was put off the plasma by the sales guy who talked about heavy power consumption, old technology and burn-in.
Anyway for £900 for the V3000 if that includes a free PS3 is a fantastic deal and I would jump at that. As for the V3000, the Freeview tuner is excellent and compares as good as by the SCART feed from my SKY+ box. Pixellation is minimal, except where the are large areas of near black that moves. Maybe this is where the plasma has the edge. The V3000 was on test in the showroom with a Blu-ray feed and looked superb with a detailed image. I'm very happy with the size of the screen in my room, I was worried a bigger screen would dominate the room. Another reason for V3000 was the nice shiny piano black casing (rather than matt black on other Sony models).
Negatives - hard to find any, the Panasonic has an SD card which the Sony lacks. Also, I don't know if I can really see any difference between the output from a standard DVD on the 1080p upscaling from 576p from the Tosh DVD recorder (via HDMI). I don't know if this is me or the TV or the DVD recorder. In fact I would have been happy with the other Sony on offer at the time - a 1080i for £200 less, but worried about future proofing. Also check out the W3000 which has a better engine, but you would need to compare.
Bottom line - very happy with the V3000, especially with the Freeview tuner which is delivering a better picture that I was expecting. With a free PS3 for £900 this is a no brainer - go for the Sony. I had a quick look at my friends TH42PZ70 and I think the plasma delivers a slightly more natural image (just a little less bright/brash), but definitely not worth £299 (price of a PS3). Go to a good local dealer who can show both models at the same time especially look at any freeview images which has a lot of near black (dimly light scenes if you have a DVD with this) to compare, but my money is on the V3000 if it includes a PS3.
Hope that helps.