Sports, Films, got to be plasma, better for motion, better for blacks and real natural colours.
With your budget, the Panasonic 42PZ85 at around £950 (better sound than the PZ80)
And you should consider an HD Ready set, say the Panny 42PX80 or LG 42PG6000.(around £600-650). You need to look and see if you can actually see the benefits of the full HD panel(the PZ80) against these HD Ready TVs at your own viewing distance. If you chose these you can add a sound system too, and still save money.
If you want to consider LCD look at the Sony 40W4000 (around £1k)
And above your price range is the Pioneer 4280XD, around £1200, probably the best of the lot. Being discontinued as Pioneer are concentrating on 50" and above plasma.