Currently only LG have passive sets on sale(Hitachi, Zalman and others do passive monitors but they are really pro only) Toshiba will be releasing their passive range starting in June with Philips and Sony also releasing around that time too.
For a 47'' LG you could take a look at an LD950(last years model but with great reviews and sub£1000 now, its the one used in pubs for Sky 3D) and for this years models check out the LG 47LW450, 47LW550 or the 47LW650