I'll go out on the limb... If you want a big neg, in a light weight and portable camera with outstanding lens choices and the utmost in control, take a moment to consider a light weight folding 4x5 field camera like a Tachihara. A kit with three lenses doesn't really take much more room or weight that a MF kit, and the tripod for a MF is equally applicable. With careful shopping it doesn't cost an arm and a leg, and 4x5 enlargers can be had for a song these days. With proper choices you can easily have near grain-less 16x20. Since you shoot landscape you will soon come to appreciate the focus and perspective control, enough so that you probably will wonder how you ever got by without movements. It may seem intimidating, but it isn't that hard. One box of film puts you there. Perhaps it is for you, and perhaps not, but I think it is well worth a couple minutes of serious consideration.