I've got a 2001 DR Z400 kicker and a 2006 DR Z400SM (you can see it on this forum). I put dirt wheels and tires on the SM. I can tell you that the kicker is a LOT faster than the SM. But that can be changed! I'll also say that the SM in SM trim is an absolute blast to ride around town and in the twisties! Your wheels and tires off your E will fit on the SM, but you will have to use the brake disks from the SM because they are bigger than on the E. Any how, I think the SM would be a good choice, but I also really like the Huskies, but parts and service might be a problem.