K30, K5 or K01????

I've been using my old K10D for quite a few years and am looking to upgrade. I'm retired on a fixed income so money is a consideration. I love my old K10D so I'm inclined to go with another slr but what I enjoy most is shooting landscapes. I've compared images from all 3 and all seem very close to giving the same quality. I'm wondering if I should go for the K01 to save the extra money because I feel that any of the 3 would give the same results on landscapes even though I don't feel the K01 would be as versatile.