There is only one answer to this and that is the classic Z1. If you want to be anal get the dual tab. There's something to right about the skinny tubes of an early DMR and the fatness of the Z1.
I remember when I upgraded from a pair of RST 381s to my first pair of Z1s. I took it for its first ride around the park and looked down below the handlebars to see this HUGE polished crown and then hearing the classic bomber squelch, and thinking that I'd made it in life - at the age of 15.
Happy memories.
Other than that another fork to consider is the RST MOZO 3.5 but it ain't no thang on the Z1.