hey mate i got a 2011 colorado turbo deisel 4wd and love it, its pretty much the same as dmax but has the holden badge its by no means fast but we tow horses and it would pull a truck. not to sure about the brand newest ones as i think they have changed the motor.
id definantly go a 4wd if i was you tho because its good fun on the weekend with the family and they retain value a lot better.