rob,
i am going through the lot slowly
mich, metzler, pirelli and so on.
Its really hard to say as all these tyres work differently on different bikes with different rider weights you have to try and see what works for you. The mich/metzler are both great all round tyres but on the 525 dont last long at all 3 rides max and the rear is fucked.
The pirelli lasted longer but wasnt as grippy and i have just bought a new set of the latest dunlop FIM jobbies to try in the new year
i dont like the ac10's but kev does

like i say it really depends on the rider and how long you want the tyre to last/grip etc etc
most of the time is comes down to price, i can get pair deals for around £75-£80 mark but i have just paid £87 trade for these new dunlops.
Mark.