My plan is to do a low chute-assisted aerobrake, then when I'm good and vertical I disconnect the parachute. Engines decelerate to about 100 m/s, then more chutes carry me down to about 1 km above the surface. From there it's just engines. I think that we'll have to be careful with aerobraking, because being in orbit around Kerbol will accelerate you to about 9 km/s. I've tried aerobraking above kerbin with those speeds, and it's not pretty. Then again, Duna's thin atmosphere will help.