How about the sony alpha A350 with 18-70mm and 55-200mm lenses at around the £520.00 mark for it all its 14.2
or the body on its own for about £330.00 or the sony alpha A700

or take a look at Panasonic Lumix DMC G1 around £490.00 with lens kit

another really good one is the Pentax K20D at around £540.00 again 14 .6 with CMOS sensor again i think sigma etc make pentax fit lenses

really you need to visit a camera store have a good look and feel if the camera body is right for you

I personally would be happy to use any of the above cameras

just checked pentax do thier own lenses not a bad price but Sigma also do pentax fit