Any carnuba wax.
£100 per LA chap I know swears by this stuff http://www.polishedbliss.co.uk/acatalog/collinite-marque-d-elegance-915.html on his dark green e46 'vert, I've not tried it but have seen the results on his in the flesh [the car, not me before you all jump in......] and it's stunning. He too tops up with AS Topaz.......
£100 per L
another good one that goes on top of a wax is sonax bsd
I though I would give this one a quicky try, I washed the car and then clayed it with a Farecla clay mitt (which are really good and fast), didn't wax but went straight on with the BSD, the results to me look amazing, looks the best it has done since it went for a pro detailing 4 years ago.