Welcome Linda, does your K-50 have aperture block failure? If so it will still work on manual lenses with an aperture ring. Natural steps up from the K-50 are the K-70, K-3 series, K1, and KP. The K-70 can suffer from aperture block failure, but not the KP and K-3 series. There will be a new K-3 model coming out next year, but it will be pretty pricey at first anyway. The K-1II and KP are the newest current models being manufactured right now. You can check out the
camera comparison chart to compare features. I think some of the cameras are on sale right now at B&H, Adorama, and Amazon, but I'm not sure how good the deals are because I'm not looking, I'm very happy with my KP..