Race Prep

With Dirt-Quake creeping up on us,it's time to start thinking about what rear tyre to use,i've never ridden on a speedway track before so i've got no idea what grip to expect.
Here's what my options are:

 1. Avon SpeedMaster MK2  3.00
 2.  Some Chinese ditch finder 2.50
 3.  Cheng Shin Knobbly  2.75
 4. Same as above but slightly worn
 5. Metzeler ME22 (worn in the middle) 2.50

all of the above  has to be better than what is already on   right?

R.H