Interplanetary Mk3, seats 20 Kerbals. Can get out of Kerbin with easily enough delta V to reach Minmus, probably a straight shot to Duna or beyond.
Has ISRU, a docking port and lift engines.
Has no trouble getting out of Duna but does struggle leaving Laythe with enough fuel to go anywhere - with higher grav worlds, really needs the booster engines it leaves behind on Kerbin.